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Edit File : client.py \| Size : 46.76 KB
"""HTTP/1.1 client library <intro stuff goes here> <other stuff, too> HTTPConnection goes through a number of "states", which define when a client may legally make another request or fetch the response for a particular request. This diagram details these state transitions: (null) \| \| HTTPConnection() v Idle \| \| putrequest() v Request-started \| \| ( putheader() )* endheaders() v Request-sent \| \| response = getresponse() v Unread-response [Response-headers-read] \|\____________________ \| \| \| response.read() \| putrequest() v v Idle Req-started-unread-response ______/\| / \| response.read() \| \| ( putheader() )* endheaders() v v Request-started Req-sent-unread-response \| \| response.read() v Request-sent This diagram presents the following rules: -- a second request may not be started until {response-headers-read} -- a response [object] cannot be retrieved until {request-sent} -- there is no differentiation between an unread response body and a partially read response body Note: this enforcement is applied by the HTTPConnection class. The HTTPResponse class does not enforce this state machine, which implies sophisticated clients may accelerate the request/response pipeline. Caution should be taken, though: accelerating the states beyond the above pattern may imply knowledge of the server's connection-close behavior for certain requests. For example, it is impossible to tell whether the server will close the connection UNTIL the response headers have been read; this means that further requests cannot be placed into the pipeline until it is known that the server will NOT be closing the connection. Logical State __state __response ------------- ------- ---------- Idle _CS_IDLE None Request-started _CS_REQ_STARTED None Request-sent _CS_REQ_SENT None Unread-response _CS_IDLE <response_class> Req-started-unread-response _CS_REQ_STARTED <response_class> Req-sent-unread-response _CS_REQ_SENT <response_class> """ import email.parser import email.message import io import os import re import socket import collections from urllib.parse import urlsplit # HTTPMessage, parse_headers(), and the HTTP status code constants are # intentionally omitted for simplicity __all__ = ["HTTPResponse", "HTTPConnection", "HTTPException", "NotConnected", "UnknownProtocol", "UnknownTransferEncoding", "UnimplementedFileMode", "IncompleteRead", "InvalidURL", "ImproperConnectionState", "CannotSendRequest", "CannotSendHeader", "ResponseNotReady", "BadStatusLine", "LineTooLong", "error", "responses"] HTTP_PORT = 80 HTTPS_PORT = 443 _UNKNOWN = 'UNKNOWN' # connection states _CS_IDLE = 'Idle' _CS_REQ_STARTED = 'Request-started' _CS_REQ_SENT = 'Request-sent' # status codes # informational CONTINUE = 100 SWITCHING_PROTOCOLS = 101 PROCESSING = 102 # successful OK = 200 CREATED = 201 ACCEPTED = 202 NON_AUTHORITATIVE_INFORMATION = 203 NO_CONTENT = 204 RESET_CONTENT = 205 PARTIAL_CONTENT = 206 MULTI_STATUS = 207 IM_USED = 226 # redirection MULTIPLE_CHOICES = 300 MOVED_PERMANENTLY = 301 FOUND = 302 SEE_OTHER = 303 NOT_MODIFIED = 304 USE_PROXY = 305 TEMPORARY_REDIRECT = 307 # client error BAD_REQUEST = 400 UNAUTHORIZED = 401 PAYMENT_REQUIRED = 402 FORBIDDEN = 403 NOT_FOUND = 404 METHOD_NOT_ALLOWED = 405 NOT_ACCEPTABLE = 406 PROXY_AUTHENTICATION_REQUIRED = 407 REQUEST_TIMEOUT = 408 CONFLICT = 409 GONE = 410 LENGTH_REQUIRED = 411 PRECONDITION_FAILED = 412 REQUEST_ENTITY_TOO_LARGE = 413 REQUEST_URI_TOO_LONG = 414 UNSUPPORTED_MEDIA_TYPE = 415 REQUESTED_RANGE_NOT_SATISFIABLE = 416 EXPECTATION_FAILED = 417 UNPROCESSABLE_ENTITY = 422 LOCKED = 423 FAILED_DEPENDENCY = 424 UPGRADE_REQUIRED = 426 PRECONDITION_REQUIRED = 428 TOO_MANY_REQUESTS = 429 REQUEST_HEADER_FIELDS_TOO_LARGE = 431 # server error INTERNAL_SERVER_ERROR = 500 NOT_IMPLEMENTED = 501 BAD_GATEWAY = 502 SERVICE_UNAVAILABLE = 503 GATEWAY_TIMEOUT = 504 HTTP_VERSION_NOT_SUPPORTED = 505 INSUFFICIENT_STORAGE = 507 NOT_EXTENDED = 510 NETWORK_AUTHENTICATION_REQUIRED = 511 # Mapping status codes to official W3C names responses = { 100: 'Continue', 101: 'Switching Protocols', 200: 'OK', 201: 'Created', 202: 'Accepted', 203: 'Non-Authoritative Information', 204: 'No Content', 205: 'Reset Content', 206: 'Partial Content', 300: 'Multiple Choices', 301: 'Moved Permanently', 302: 'Found', 303: 'See Other', 304: 'Not Modified', 305: 'Use Proxy', 306: '(Unused)', 307: 'Temporary Redirect', 400: 'Bad Request', 401: 'Unauthorized', 402: 'Payment Required', 403: 'Forbidden', 404: 'Not Found', 405: 'Method Not Allowed', 406: 'Not Acceptable', 407: 'Proxy Authentication Required', 408: 'Request Timeout', 409: 'Conflict', 410: 'Gone', 411: 'Length Required', 412: 'Precondition Failed', 413: 'Request Entity Too Large', 414: 'Request-URI Too Long', 415: 'Unsupported Media Type', 416: 'Requested Range Not Satisfiable', 417: 'Expectation Failed', 428: 'Precondition Required', 429: 'Too Many Requests', 431: 'Request Header Fields Too Large', 500: 'Internal Server Error', 501: 'Not Implemented', 502: 'Bad Gateway', 503: 'Service Unavailable', 504: 'Gateway Timeout', 505: 'HTTP Version Not Supported', 511: 'Network Authentication Required', } # maximal amount of data to read at one time in _safe_read MAXAMOUNT = 1048576 # maximal line length when calling readline(). _MAXLINE = 65536 _MAXHEADERS = 100 # Header name/value ABNF (http://tools.ietf.org/html/rfc7230#section-3.2) # # VCHAR = %x21-7E # obs-text = %x80-FF # header-field = field-name ":" OWS field-value OWS # field-name = token # field-value = ( field-content / obs-fold ) # field-content = field-vchar [ 1( SP / HTAB ) field-vchar ] # field-vchar = VCHAR / obs-text # # obs-fold = CRLF 1( SP / HTAB ) # ; obsolete line folding # ; see Section 3.2.4 # token = 1tchar # # tchar = "!" / "#" / "$" / "%" / "&" / "'" / "" # / "+" / "-" / "." / "^" / "_" / "`" / "\|" / "~" # / DIGIT / ALPHA # ; any VCHAR, except delimiters # # VCHAR defined in http://tools.ietf.org/html/rfc5234#appendix-B.1 # the patterns for both name and value are more leniant than RFC # definitions to allow for backwards compatibility _is_legal_header_name = re.compile(rb'[^:\s][^:\r\n]').fullmatch _is_illegal_header_value = re.compile(rb'\n(?![ \t])\|\r(?![ \t\n])').search # We always set the Content-Length header for these methods because some # servers will otherwise respond with a 411 _METHODS_EXPECTING_BODY = {'PATCH', 'POST', 'PUT'} class HTTPMessage(email.message.Message): # XXX The only usage of this method is in # http.server.CGIHTTPRequestHandler. Maybe move the code there so # that it doesn't need to be part of the public API. The API has # never been defined so this could cause backwards compatibility # issues. def getallmatchingheaders(self, name): """Find all header lines matching a given header name. Look through the list of headers and find all lines matching a given header name (and their continuation lines). A list of the lines is returned, without interpretation. If the header does not occur, an empty list is returned. If the header occurs multiple times, all occurrences are returned. Case is not important in the header name. """ name = name.lower() + ':' n = len(name) lst = [] hit = 0 for line in self.keys(): if line[:n].lower() == name: hit = 1 elif not line[:1].isspace(): hit = 0 if hit: lst.append(line) return lst def parse_headers(fp, _class=HTTPMessage): """Parses only RFC2822 headers from a file pointer. email Parser wants to see strings rather than bytes. But a TextIOWrapper around self.rfile would buffer too many bytes from the stream, bytes which we later need to read as bytes. So we read the correct bytes here, as bytes, for email Parser to parse. """ headers = [] while True: line = fp.readline(_MAXLINE + 1) if len(line) > _MAXLINE: raise LineTooLong("header line") headers.append(line) if len(headers) > _MAXHEADERS: raise HTTPException("got more than %d headers" % _MAXHEADERS) if line in (b'\r\n', b'\n', b''): break hstring = b''.join(headers).decode('iso-8859-1') return email.parser.Parser(_class=_class).parsestr(hstring) class HTTPResponse(io.RawIOBase): # See RFC 2616 sec 19.6 and RFC 1945 sec 6 for details. # The bytes from the socket object are iso-8859-1 strings. # See RFC 2616 sec 2.2 which notes an exception for MIME-encoded # text following RFC 2047. The basic status line parsing only # accepts iso-8859-1. def __init__(self, sock, debuglevel=0, method=None, url=None): # If the response includes a content-length header, we need to # make sure that the client doesn't read more than the # specified number of bytes. If it does, it will block until # the server times out and closes the connection. This will # happen if a self.fp.read() is done (without a size) whether # self.fp is buffered or not. So, no self.fp.read() by # clients unless they know what they are doing. self.fp = sock.makefile("rb") self.debuglevel = debuglevel self._method = method # The HTTPResponse object is returned via urllib. The clients # of http and urllib expect different attributes for the # headers. headers is used here and supports urllib. msg is # provided as a backwards compatibility layer for http # clients. self.headers = self.msg = None # from the Status-Line of the response self.version = _UNKNOWN # HTTP-Version self.status = _UNKNOWN # Status-Code self.reason = _UNKNOWN # Reason-Phrase self.chunked = _UNKNOWN # is "chunked" being used? self.chunk_left = _UNKNOWN # bytes left to read in current chunk self.length = _UNKNOWN # number of bytes left in response self.will_close = _UNKNOWN # conn will close at end of response def _read_status(self): line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1") if len(line) > _MAXLINE: raise LineTooLong("status line") if self.debuglevel > 0: print("reply:", repr(line)) if not line: # Presumably, the server closed the connection before # sending a valid response. raise BadStatusLine(line) try: version, status, reason = line.split(None, 2) except ValueError: try: version, status = line.split(None, 1) reason = "" except ValueError: # empty version will cause next test to fail. version = "" if not version.startswith("HTTP/"): self._close_conn() raise BadStatusLine(line) # The status code is a three-digit number try: status = int(status) if status < 100 or status > 999: raise BadStatusLine(line) except ValueError: raise BadStatusLine(line) return version, status, reason def begin(self): if self.headers is not None: # we've already started reading the response return # read until we get a non-100 response while True: version, status, reason = self._read_status() if status != CONTINUE: break # skip the header from the 100 response while True: skip = self.fp.readline(_MAXLINE + 1) if len(skip) > _MAXLINE: raise LineTooLong("header line") skip = skip.strip() if not skip: break if self.debuglevel > 0: print("header:", skip) self.code = self.status = status self.reason = reason.strip() if version in ("HTTP/1.0", "HTTP/0.9"): # Some servers might still return "0.9", treat it as 1.0 anyway self.version = 10 elif version.startswith("HTTP/1."): self.version = 11 # use HTTP/1.1 code for HTTP/1.x where x>=1 else: raise UnknownProtocol(version) self.headers = self.msg = parse_headers(self.fp) if self.debuglevel > 0: for hdr in self.headers: print("header:", hdr, end=" ") # are we using the chunked-style of transfer encoding? tr_enc = self.headers.get("transfer-encoding") if tr_enc and tr_enc.lower() == "chunked": self.chunked = True self.chunk_left = None else: self.chunked = False # will the connection close at the end of the response? self.will_close = self._check_close() # do we have a Content-Length? # NOTE: RFC 2616, S4.4, #3 says we ignore this if tr_enc is "chunked" self.length = None length = self.headers.get("content-length") # are we using the chunked-style of transfer encoding? tr_enc = self.headers.get("transfer-encoding") if length and not self.chunked: try: self.length = int(length) except ValueError: self.length = None else: if self.length < 0: # ignore nonsensical negative lengths self.length = None else: self.length = None # does the body have a fixed length? (of zero) if (status == NO_CONTENT or status == NOT_MODIFIED or 100 <= status < 200 or # 1xx codes self._method == "HEAD"): self.length = 0 # if the connection remains open, and we aren't using chunked, and # a content-length was not provided, then assume that the connection # WILL close. if (not self.will_close and not self.chunked and self.length is None): self.will_close = True def _check_close(self): conn = self.headers.get("connection") if self.version == 11: # An HTTP/1.1 proxy is assumed to stay open unless # explicitly closed. conn = self.headers.get("connection") if conn and "close" in conn.lower(): return True return False # Some HTTP/1.0 implementations have support for persistent # connections, using rules different than HTTP/1.1. # For older HTTP, Keep-Alive indicates persistent connection. if self.headers.get("keep-alive"): return False # At least Akamai returns a "Connection: Keep-Alive" header, # which was supposed to be sent by the client. if conn and "keep-alive" in conn.lower(): return False # Proxy-Connection is a netscape hack. pconn = self.headers.get("proxy-connection") if pconn and "keep-alive" in pconn.lower(): return False # otherwise, assume it will close return True def _close_conn(self): fp = self.fp self.fp = None fp.close() def close(self): try: super().close() # set "closed" flag finally: if self.fp: self._close_conn() # These implementations are for the benefit of io.BufferedReader. # XXX This class should probably be revised to act more like # the "raw stream" that BufferedReader expects. def flush(self): super().flush() if self.fp: self.fp.flush() def readable(self): return True # End of "raw stream" methods def isclosed(self): """True if the connection is closed.""" # NOTE: it is possible that we will not ever call self.close(). This # case occurs when will_close is TRUE, length is None, and we # read up to the last byte, but NOT past it. # # IMPLIES: if will_close is FALSE, then self.close() will ALWAYS be # called, meaning self.isclosed() is meaningful. return self.fp is None def read(self, amt=None): if self.fp is None: return b"" if self._method == "HEAD": self._close_conn() return b"" if amt is not None: # Amount is given, so call base class version # (which is implemented in terms of self.readinto) return super(HTTPResponse, self).read(amt) else: # Amount is not given (unbounded read) so we must check self.length # and self.chunked if self.chunked: return self._readall_chunked() if self.length is None: s = self.fp.read() else: try: s = self._safe_read(self.length) except IncompleteRead: self._close_conn() raise self.length = 0 self._close_conn() # we read everything return s def readinto(self, b): if self.fp is None: return 0 if self._method == "HEAD": self._close_conn() return 0 if self.chunked: return self._readinto_chunked(b) if self.length is not None: if len(b) > self.length: # clip the read to the "end of response" b = memoryview(b)[0:self.length] # we do not use _safe_read() here because this may be a .will_close # connection, and the user is reading more bytes than will be provided # (for example, reading in 1k chunks) n = self.fp.readinto(b) if not n and b: # Ideally, we would raise IncompleteRead if the content-length # wasn't satisfied, but it might break compatibility. self._close_conn() elif self.length is not None: self.length -= n if not self.length: self._close_conn() return n def _read_next_chunk_size(self): # Read the next chunk size from the file line = self.fp.readline(_MAXLINE + 1) if len(line) > _MAXLINE: raise LineTooLong("chunk size") i = line.find(b";") if i >= 0: line = line[:i] # strip chunk-extensions try: return int(line, 16) except ValueError: # close the connection as protocol synchronisation is # probably lost self._close_conn() raise def _read_and_discard_trailer(self): # read and discard trailer up to the CRLF terminator ### note: we shouldn't have any trailers! while True: line = self.fp.readline(_MAXLINE + 1) if len(line) > _MAXLINE: raise LineTooLong("trailer line") if not line: # a vanishingly small number of sites EOF without # sending the trailer break if line in (b'\r\n', b'\n', b''): break def _readall_chunked(self): assert self.chunked != _UNKNOWN chunk_left = self.chunk_left value = [] while True: if chunk_left is None: try: chunk_left = self._read_next_chunk_size() if chunk_left == 0: break except ValueError: raise IncompleteRead(b''.join(value)) value.append(self._safe_read(chunk_left)) # we read the whole chunk, get another self._safe_read(2) # toss the CRLF at the end of the chunk chunk_left = None self._read_and_discard_trailer() # we read everything; close the "file" self._close_conn() return b''.join(value) def _readinto_chunked(self, b): assert self.chunked != _UNKNOWN chunk_left = self.chunk_left total_bytes = 0 mvb = memoryview(b) while True: if chunk_left is None: try: chunk_left = self._read_next_chunk_size() if chunk_left == 0: break except ValueError: raise IncompleteRead(bytes(b[0:total_bytes])) if len(mvb) < chunk_left: n = self._safe_readinto(mvb) self.chunk_left = chunk_left - n return total_bytes + n elif len(mvb) == chunk_left: n = self._safe_readinto(mvb) self._safe_read(2) # toss the CRLF at the end of the chunk self.chunk_left = None return total_bytes + n else: temp_mvb = mvb[0:chunk_left] n = self._safe_readinto(temp_mvb) mvb = mvb[n:] total_bytes += n # we read the whole chunk, get another self._safe_read(2) # toss the CRLF at the end of the chunk chunk_left = None self._read_and_discard_trailer() # we read everything; close the "file" self._close_conn() return total_bytes def _safe_read(self, amt): """Read the number of bytes requested, compensating for partial reads. Normally, we have a blocking socket, but a read() can be interrupted by a signal (resulting in a partial read). Note that we cannot distinguish between EOF and an interrupt when zero bytes have been read. IncompleteRead() will be raised in this situation. This function should be used when <amt> bytes "should" be present for reading. If the bytes are truly not available (due to EOF), then the IncompleteRead exception can be used to detect the problem. """ s = [] while amt > 0: chunk = self.fp.read(min(amt, MAXAMOUNT)) if not chunk: raise IncompleteRead(b''.join(s), amt) s.append(chunk) amt -= len(chunk) return b"".join(s) def _safe_readinto(self, b): """Same as _safe_read, but for reading into a buffer.""" total_bytes = 0 mvb = memoryview(b) while total_bytes < len(b): if MAXAMOUNT < len(mvb): temp_mvb = mvb[0:MAXAMOUNT] n = self.fp.readinto(temp_mvb) else: n = self.fp.readinto(mvb) if not n: raise IncompleteRead(bytes(mvb[0:total_bytes]), len(b)) mvb = mvb[n:] total_bytes += n return total_bytes def fileno(self): return self.fp.fileno() def getheader(self, name, default=None): if self.headers is None: raise ResponseNotReady() headers = self.headers.get_all(name) or default if isinstance(headers, str) or not hasattr(headers, '__iter__'): return headers else: return ', '.join(headers) def getheaders(self): """Return list of (header, value) tuples.""" if self.headers is None: raise ResponseNotReady() return list(self.headers.items()) # We override IOBase.__iter__ so that it doesn't check for closed-ness def __iter__(self): return self # For compatibility with old-style urllib responses. def info(self): return self.headers def geturl(self): return self.url def getcode(self): return self.status class HTTPConnection: _http_vsn = 11 _http_vsn_str = 'HTTP/1.1' response_class = HTTPResponse default_port = HTTP_PORT auto_open = 1 debuglevel = 0 # TCP Maximum Segment Size (MSS) is determined by the TCP stack on # a per-connection basis. There is no simple and efficient # platform independent mechanism for determining the MSS, so # instead a reasonable estimate is chosen. The getsockopt() # interface using the TCP_MAXSEG parameter may be a suitable # approach on some operating systems. A value of 16KiB is chosen # as a reasonable estimate of the maximum MSS. mss = 16384 def __init__(self, host, port=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT, source_address=None): self.timeout = timeout self.source_address = source_address self.sock = None self._buffer = [] self.__response = None self.__state = _CS_IDLE self._method = None self._tunnel_host = None self._tunnel_port = None self._tunnel_headers = {} (self.host, self.port) = self._get_hostport(host, port) # This is stored as an instance variable to allow unit # tests to replace it with a suitable mockup self._create_connection = socket.create_connection def set_tunnel(self, host, port=None, headers=None): """Set up host and port for HTTP CONNECT tunnelling. In a connection that uses HTTP CONNECT tunneling, the host passed to the constructor is used as a proxy server that relays all communication to the endpoint passed to `set_tunnel`. This done by sending an HTTP CONNECT request to the proxy server when the connection is established. This method must be called before the HTML connection has been established. The headers argument should be a mapping of extra HTTP headers to send with the CONNECT request. """ if self.sock: raise RuntimeError("Can't set up tunnel for established connection") self._tunnel_host, self._tunnel_port = self._get_hostport(host, port) if headers: self._tunnel_headers = headers else: self._tunnel_headers.clear() def _get_hostport(self, host, port): if port is None: i = host.rfind(':') j = host.rfind(']') # ipv6 addresses have [...] if i > j: try: port = int(host[i+1:]) except ValueError: if host[i+1:] == "": # http://foo.com:/ == http://foo.com/ port = self.default_port else: raise InvalidURL("nonnumeric port: '%s'" % host[i+1:]) host = host[:i] else: port = self.default_port if host and host[0] == '[' and host[-1] == ']': host = host[1:-1] return (host, port) def set_debuglevel(self, level): self.debuglevel = level def _tunnel(self): connect_str = "CONNECT %s:%d HTTP/1.0\r\n" % (self._tunnel_host, self._tunnel_port) connect_bytes = connect_str.encode("ascii") self.send(connect_bytes) for header, value in self._tunnel_headers.items(): header_str = "%s: %s\r\n" % (header, value) header_bytes = header_str.encode("latin-1") self.send(header_bytes) self.send(b'\r\n') response = self.response_class(self.sock, method=self._method) (version, code, message) = response._read_status() if code != 200: self.close() raise OSError("Tunnel connection failed: %d %s" % (code, message.strip())) while True: line = response.fp.readline(_MAXLINE + 1) if len(line) > _MAXLINE: raise LineTooLong("header line") if not line: # for sites which EOF without sending a trailer break if line in (b'\r\n', b'\n', b''): break def connect(self): """Connect to the host and port specified in __init__.""" self.sock = self._create_connection((self.host,self.port), self.timeout, self.source_address) if self._tunnel_host: self._tunnel() def close(self): """Close the connection to the HTTP server.""" self.__state = _CS_IDLE try: sock = self.sock if sock: self.sock = None sock.close() # close it manually... there may be other refs finally: response = self.__response if response: self.__response = None response.close() def send(self, data): """Send `data' to the server. ``data`` can be a string object, a bytes object, an array object, a file-like object that supports a .read() method, or an iterable object. """ if self.sock is None: if self.auto_open: self.connect() else: raise NotConnected() if self.debuglevel > 0: print("send:", repr(data)) blocksize = 8192 if hasattr(data, "read") : if self.debuglevel > 0: print("sendIng a read()able") encode = False try: mode = data.mode except AttributeError: # io.BytesIO and other file-like objects don't have a `mode` # attribute. pass else: if "b" not in mode: encode = True if self.debuglevel > 0: print("encoding file using iso-8859-1") while 1: datablock = data.read(blocksize) if not datablock: break if encode: datablock = datablock.encode("iso-8859-1") self.sock.sendall(datablock) return try: self.sock.sendall(data) except TypeError: if isinstance(data, collections.Iterable): for d in data: self.sock.sendall(d) else: raise TypeError("data should be a bytes-like object " "or an iterable, got %r" % type(data)) def _output(self, s): """Add a line of output to the current request buffer. Assumes that the line does not end with \\r\\n. """ self._buffer.append(s) def _send_output(self, message_body=None): """Send the currently buffered request and clear the buffer. Appends an extra \\r\\n to the buffer. A message_body may be specified, to be appended to the request. """ self._buffer.extend((b"", b"")) msg = b"\r\n".join(self._buffer) del self._buffer[:] # If msg and message_body are sent in a single send() call, # it will avoid performance problems caused by the interaction # between delayed ack and the Nagle algorithm. However, # there is no performance gain if the message is larger # than MSS (and there is a memory penalty for the message # copy). if isinstance(message_body, bytes) and len(message_body) < self.mss: msg += message_body message_body = None self.send(msg) if message_body is not None: # message_body was not a string (i.e. it is a file), and # we must run the risk of Nagle. self.send(message_body) def putrequest(self, method, url, skip_host=0, skip_accept_encoding=0): """Send a request to the server. `method' specifies an HTTP request method, e.g. 'GET'. `url' specifies the object being requested, e.g. '/index.html'. `skip_host' if True does not add automatically a 'Host:' header `skip_accept_encoding' if True does not add automatically an 'Accept-Encoding:' header """ # if a prior response has been completed, then forget about it. if self.__response and self.__response.isclosed(): self.__response = None # in certain cases, we cannot issue another request on this connection. # this occurs when: # 1) we are in the process of sending a request. (_CS_REQ_STARTED) # 2) a response to a previous request has signalled that it is going # to close the connection upon completion. # 3) the headers for the previous response have not been read, thus # we cannot determine whether point (2) is true. (_CS_REQ_SENT) # # if there is no prior response, then we can request at will. # # if point (2) is true, then we will have passed the socket to the # response (effectively meaning, "there is no prior response"), and # will open a new one when a new request is made. # # Note: if a prior response exists, then we can start a new request. # We are not allowed to begin fetching the response to this new # request, however, until that prior response is complete. # if self.__state == _CS_IDLE: self.__state = _CS_REQ_STARTED else: raise CannotSendRequest(self.__state) # Save the method we use, we need it later in the response phase self._method = method if not url: url = '/' request = '%s %s %s' % (method, url, self._http_vsn_str) # Non-ASCII characters should have been eliminated earlier self._output(request.encode('ascii')) if self._http_vsn == 11: # Issue some standard headers for better HTTP/1.1 compliance if not skip_host: # this header is issued only for HTTP/1.1 # connections. more specifically, this means it is # only issued when the client uses the new # HTTPConnection() class. backwards-compat clients # will be using HTTP/1.0 and those clients may be # issuing this header themselves. we should NOT issue # it twice; some web servers (such as Apache) barf # when they see two Host: headers # If we need a non-standard port,include it in the # header. If the request is going through a proxy, # but the host of the actual URL, not the host of the # proxy. netloc = '' if url.startswith('http'): nil, netloc, nil, nil, nil = urlsplit(url) if netloc: try: netloc_enc = netloc.encode("ascii") except UnicodeEncodeError: netloc_enc = netloc.encode("idna") self.putheader('Host', netloc_enc) else: if self._tunnel_host: host = self._tunnel_host port = self._tunnel_port else: host = self.host port = self.port try: host_enc = host.encode("ascii") except UnicodeEncodeError: host_enc = host.encode("idna") # As per RFC 273, IPv6 address should be wrapped with [] # when used as Host header if host.find(':') >= 0: host_enc = b'[' + host_enc + b']' if port == self.default_port: self.putheader('Host', host_enc) else: host_enc = host_enc.decode("ascii") self.putheader('Host', "%s:%s" % (host_enc, port)) # note: we are assuming that clients will not attempt to set these # headers since this library must deal with the # consequences. this also means that when the supporting # libraries are updated to recognize other forms, then this # code should be changed (removed or updated). # we only want a Content-Encoding of "identity" since we don't # support encodings such as x-gzip or x-deflate. if not skip_accept_encoding: self.putheader('Accept-Encoding', 'identity') # we can accept "chunked" Transfer-Encodings, but no others # NOTE: no TE header implies only "chunked" #self.putheader('TE', 'chunked') # if TE is supplied in the header, then it must appear in a # Connection header. #self.putheader('Connection', 'TE') else: # For HTTP/1.0, the server will assume "not chunked" pass def putheader(self, header, values): """Send a request header line to the server. For example: h.putheader('Accept', 'text/html') """ if self.__state != _CS_REQ_STARTED: raise CannotSendHeader() if hasattr(header, 'encode'): header = header.encode('ascii') if not _is_legal_header_name(header): raise ValueError('Invalid header name %r' % (header,)) values = list(values) for i, one_value in enumerate(values): if hasattr(one_value, 'encode'): values[i] = one_value.encode('latin-1') elif isinstance(one_value, int): values[i] = str(one_value).encode('ascii') if _is_illegal_header_value(values[i]): raise ValueError('Invalid header value %r' % (values[i],)) value = b'\r\n\t'.join(values) header = header + b': ' + value self._output(header) def endheaders(self, message_body=None): """Indicate that the last header line has been sent to the server. This method sends the request to the server. The optional message_body argument can be used to pass a message body associated with the request. The message body will be sent in the same packet as the message headers if it is a string, otherwise it is sent as a separate packet. """ if self.__state == _CS_REQ_STARTED: self.__state = _CS_REQ_SENT else: raise CannotSendHeader() self._send_output(message_body) def request(self, method, url, body=None, headers={}): """Send a complete request to the server.""" self._send_request(method, url, body, headers) def _set_content_length(self, body, method): # Set the content-length based on the body. If the body is "empty", we # set Content-Length: 0 for methods that expect a body (RFC 7230, # Section 3.3.2). If the body is set for other methods, we set the # header provided we can figure out what the length is. thelen = None method_expects_body = method.upper() in _METHODS_EXPECTING_BODY if body is None and method_expects_body: thelen = '0' elif body is not None: try: thelen = str(len(body)) except TypeError: # If this is a file-like object, try to # fstat its file descriptor try: thelen = str(os.fstat(body.fileno()).st_size) except (AttributeError, OSError): # Don't send a length if this failed if self.debuglevel > 0: print("Cannot stat!!") if thelen is not None: self.putheader('Content-Length', thelen) def _send_request(self, method, url, body, headers): # Honor explicitly requested Host: and Accept-Encoding: headers. header_names = dict.fromkeys([k.lower() for k in headers]) skips = {} if 'host' in header_names: skips['skip_host'] = 1 if 'accept-encoding' in header_names: skips['skip_accept_encoding'] = 1 self.putrequest(method, url, skips) if 'content-length' not in header_names: self._set_content_length(body, method) for hdr, value in headers.items(): self.putheader(hdr, value) if isinstance(body, str): # RFC 2616 Section 3.7.1 says that text default has a # default charset of iso-8859-1. body = body.encode('iso-8859-1') self.endheaders(body) def getresponse(self): """Get the response from the server. If the HTTPConnection is in the correct state, returns an instance of HTTPResponse or of whatever object is returned by class the response_class variable. If a request has not been sent or if a previous response has not be handled, ResponseNotReady is raised. If the HTTP response indicates that the connection should be closed, then it will be closed before the response is returned. When the connection is closed, the underlying socket is closed. """ # if a prior response has been completed, then forget about it. if self.__response and self.__response.isclosed(): self.__response = None # if a prior response exists, then it must be completed (otherwise, we # cannot read this response's header to determine the connection-close # behavior) # # note: if a prior response existed, but was connection-close, then the # socket and response were made independent of this HTTPConnection # object since a new request requires that we open a whole new # connection # # this means the prior response had one of two states: # 1) will_close: this connection was reset and the prior socket and # response operate independently # 2) persistent: the response was retained and we await its # isclosed() status to become true. # if self.__state != _CS_REQ_SENT or self.__response: raise ResponseNotReady(self.__state) if self.debuglevel > 0: response = self.response_class(self.sock, self.debuglevel, method=self._method) else: response = self.response_class(self.sock, method=self._method) try: response.begin() assert response.will_close != _UNKNOWN self.__state = _CS_IDLE if response.will_close: # this effectively passes the connection to the response self.close() else: # remember this, so we can tell when it is complete self.__response = response return response except: response.close() raise try: import ssl except ImportError: pass else: class HTTPSConnection(HTTPConnection): "This class allows communication via SSL." default_port = HTTPS_PORT # XXX Should key_file and cert_file be deprecated in favour of context? def __init__(self, host, port=None, key_file=None, cert_file=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT, source_address=None, , context=None, check_hostname=None): super(HTTPSConnection, self).__init__(host, port, timeout, source_address) self.key_file = key_file self.cert_file = cert_file if context is None: context = ssl._create_default_https_context() will_verify = context.verify_mode != ssl.CERT_NONE if check_hostname is None: check_hostname = context.check_hostname if check_hostname and not will_verify: raise ValueError("check_hostname needs a SSL context with " "either CERT_OPTIONAL or CERT_REQUIRED") if key_file or cert_file: context.load_cert_chain(cert_file, key_file) self._context = context self._check_hostname = check_hostname def connect(self): "Connect to a host on a given (SSL) port." super().connect() if self._tunnel_host: server_hostname = self._tunnel_host else: server_hostname = self.host self.sock = self._context.wrap_socket(self.sock, server_hostname=server_hostname) if not self._context.check_hostname and self._check_hostname: try: ssl.match_hostname(self.sock.getpeercert(), server_hostname) except Exception: self.sock.shutdown(socket.SHUT_RDWR) self.sock.close() raise __all__.append("HTTPSConnection") class HTTPException(Exception): # Subclasses that define an __init__ must call Exception.__init__ # or define self.args. Otherwise, str() will fail. pass class NotConnected(HTTPException): pass class InvalidURL(HTTPException): pass class UnknownProtocol(HTTPException): def __init__(self, version): self.args = version, self.version = version class UnknownTransferEncoding(HTTPException): pass class UnimplementedFileMode(HTTPException): pass class IncompleteRead(HTTPException): def __init__(self, partial, expected=None): self.args = partial, self.partial = partial self.expected = expected def __repr__(self): if self.expected is not None: e = ', %i more expected' % self.expected else: e = '' return 'IncompleteRead(%i bytes read%s)' % (len(self.partial), e) def __str__(self): return repr(self) class ImproperConnectionState(HTTPException): pass class CannotSendRequest(ImproperConnectionState): pass class CannotSendHeader(ImproperConnectionState): pass class ResponseNotReady(ImproperConnectionState): pass class BadStatusLine(HTTPException): def __init__(self, line): if not line: line = repr(line) self.args = line, self.line = line class LineTooLong(HTTPException): def __init__(self, line_type): HTTPException.__init__(self, "got more than %d bytes when reading %s" % (_MAXLINE, line_type)) # for backwards compatibility error = HTTPException Back

Edit File : client.py | Size : 46.76 KB

"""HTTP/1.1 client library

HTTPConnection goes through a number of "states", which define when a client
may legally make another request or fetch the response for a particular
request. This diagram details these state transitions:

(null)
      |
      | HTTPConnection()
      v
    Idle
      |
      | putrequest()
      v
    Request-started
      |
      | ( putheader() )*  endheaders()
      v
    Request-sent
      |
      | response = getresponse()
      v
    Unread-response   [Response-headers-read]
      |\____________________
      |                     |
      | response.read()     | putrequest()
      v                     v
    Idle                  Req-started-unread-response
                     ______/|
                   /        |
   response.read() |        | ( putheader() )*  endheaders()
                   v        v
       Request-started    Req-sent-unread-response
                            |
                            | response.read()
                            v
                          Request-sent

This diagram presents the following rules:
  -- a second request may not be started until {response-headers-read}
  -- a response [object] cannot be retrieved until {request-sent}
  -- there is no differentiation between an unread response body and a
     partially read response body

Note: this enforcement is applied by the HTTPConnection class. The
      HTTPResponse class does not enforce this state machine, which
      implies sophisticated clients may accelerate the request/response
      pipeline. Caution should be taken, though: accelerating the states
      beyond the above pattern may imply knowledge of the server's
      connection-close behavior for certain requests. For example, it
      is impossible to tell whether the server will close the connection
      UNTIL the response headers have been read; this means that further
      requests cannot be placed into the pipeline until it is known that
      the server will NOT be closing the connection.

Logical State                  __state            __response
-------------                  -------            ----------
Idle                           _CS_IDLE           None
Request-started                _CS_REQ_STARTED    None
Request-sent                   _CS_REQ_SENT       None
Unread-response                _CS_IDLE           <response_class>
Req-started-unread-response    _CS_REQ_STARTED    <response_class>
Req-sent-unread-response       _CS_REQ_SENT       <response_class>
"""

import email.parser
import email.message
import io
import os
import re
import socket
import collections
from urllib.parse import urlsplit

# HTTPMessage, parse_headers(), and the HTTP status code constants are
# intentionally omitted for simplicity
__all__ = ["HTTPResponse", "HTTPConnection",
           "HTTPException", "NotConnected", "UnknownProtocol",
           "UnknownTransferEncoding", "UnimplementedFileMode",
           "IncompleteRead", "InvalidURL", "ImproperConnectionState",
           "CannotSendRequest", "CannotSendHeader", "ResponseNotReady",
           "BadStatusLine", "LineTooLong", "error", "responses"]

HTTP_PORT = 80
HTTPS_PORT = 443

_UNKNOWN = 'UNKNOWN'

# connection states
_CS_IDLE = 'Idle'
_CS_REQ_STARTED = 'Request-started'
_CS_REQ_SENT = 'Request-sent'

# status codes
# informational
CONTINUE = 100
SWITCHING_PROTOCOLS = 101
PROCESSING = 102

# successful
OK = 200
CREATED = 201
ACCEPTED = 202
NON_AUTHORITATIVE_INFORMATION = 203
NO_CONTENT = 204
RESET_CONTENT = 205
PARTIAL_CONTENT = 206
MULTI_STATUS = 207
IM_USED = 226

# redirection
MULTIPLE_CHOICES = 300
MOVED_PERMANENTLY = 301
FOUND = 302
SEE_OTHER = 303
NOT_MODIFIED = 304
USE_PROXY = 305
TEMPORARY_REDIRECT = 307

# client error
BAD_REQUEST = 400
UNAUTHORIZED = 401
PAYMENT_REQUIRED = 402
FORBIDDEN = 403
NOT_FOUND = 404
METHOD_NOT_ALLOWED = 405
NOT_ACCEPTABLE = 406
PROXY_AUTHENTICATION_REQUIRED = 407
REQUEST_TIMEOUT = 408
CONFLICT = 409
GONE = 410
LENGTH_REQUIRED = 411
PRECONDITION_FAILED = 412
REQUEST_ENTITY_TOO_LARGE = 413
REQUEST_URI_TOO_LONG = 414
UNSUPPORTED_MEDIA_TYPE = 415
REQUESTED_RANGE_NOT_SATISFIABLE = 416
EXPECTATION_FAILED = 417
UNPROCESSABLE_ENTITY = 422
LOCKED = 423
FAILED_DEPENDENCY = 424
UPGRADE_REQUIRED = 426
PRECONDITION_REQUIRED = 428
TOO_MANY_REQUESTS = 429
REQUEST_HEADER_FIELDS_TOO_LARGE = 431

# server error
INTERNAL_SERVER_ERROR = 500
NOT_IMPLEMENTED = 501
BAD_GATEWAY = 502
SERVICE_UNAVAILABLE = 503
GATEWAY_TIMEOUT = 504
HTTP_VERSION_NOT_SUPPORTED = 505
INSUFFICIENT_STORAGE = 507
NOT_EXTENDED = 510
NETWORK_AUTHENTICATION_REQUIRED = 511

# Mapping status codes to official W3C names
responses = {
    100: 'Continue',
    101: 'Switching Protocols',

200: 'OK',
    201: 'Created',
    202: 'Accepted',
    203: 'Non-Authoritative Information',
    204: 'No Content',
    205: 'Reset Content',
    206: 'Partial Content',

300: 'Multiple Choices',
    301: 'Moved Permanently',
    302: 'Found',
    303: 'See Other',
    304: 'Not Modified',
    305: 'Use Proxy',
    306: '(Unused)',
    307: 'Temporary Redirect',

400: 'Bad Request',
    401: 'Unauthorized',
    402: 'Payment Required',
    403: 'Forbidden',
    404: 'Not Found',
    405: 'Method Not Allowed',
    406: 'Not Acceptable',
    407: 'Proxy Authentication Required',
    408: 'Request Timeout',
    409: 'Conflict',
    410: 'Gone',
    411: 'Length Required',
    412: 'Precondition Failed',
    413: 'Request Entity Too Large',
    414: 'Request-URI Too Long',
    415: 'Unsupported Media Type',
    416: 'Requested Range Not Satisfiable',
    417: 'Expectation Failed',
    428: 'Precondition Required',
    429: 'Too Many Requests',
    431: 'Request Header Fields Too Large',

500: 'Internal Server Error',
    501: 'Not Implemented',
    502: 'Bad Gateway',
    503: 'Service Unavailable',
    504: 'Gateway Timeout',
    505: 'HTTP Version Not Supported',
    511: 'Network Authentication Required',
}

# maximal amount of data to read at one time in _safe_read
MAXAMOUNT = 1048576

# maximal line length when calling readline().
_MAXLINE = 65536
_MAXHEADERS = 100

# Header name/value ABNF (http://tools.ietf.org/html/rfc7230#section-3.2)
#
# VCHAR          = %x21-7E
# obs-text       = %x80-FF
# header-field   = field-name ":" OWS field-value OWS
# field-name     = token
# field-value    = *( field-content / obs-fold )
# field-content  = field-vchar [ 1*( SP / HTAB ) field-vchar ]
# field-vchar    = VCHAR / obs-text
#
# obs-fold       = CRLF 1*( SP / HTAB )
#                ; obsolete line folding
#                ; see Section 3.2.4

# token          = 1*tchar
#
# tchar          = "!" / "#" / "$" / "%" / "&" / "'" / "*"
#                / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
#                / DIGIT / ALPHA
#                ; any VCHAR, except delimiters
#
# VCHAR defined in http://tools.ietf.org/html/rfc5234#appendix-B.1

# the patterns for both name and value are more leniant than RFC
# definitions to allow for backwards compatibility
_is_legal_header_name = re.compile(rb'[^:\s][^:\r\n]*').fullmatch
_is_illegal_header_value = re.compile(rb'\n(?![ \t])|\r(?![ \t\n])').search

# We always set the Content-Length header for these methods because some
# servers will otherwise respond with a 411
_METHODS_EXPECTING_BODY = {'PATCH', 'POST', 'PUT'}

class HTTPMessage(email.message.Message):
    # XXX The only usage of this method is in
    # http.server.CGIHTTPRequestHandler.  Maybe move the code there so
    # that it doesn't need to be part of the public API.  The API has
    # never been defined so this could cause backwards compatibility
    # issues.

def getallmatchingheaders(self, name):
        """Find all header lines matching a given header name.

Look through the list of headers and find all lines matching a given
        header name (and their continuation lines).  A list of the lines is
        returned, without interpretation.  If the header does not occur, an
        empty list is returned.  If the header occurs multiple times, all
        occurrences are returned.  Case is not important in the header name.

"""
        name = name.lower() + ':'
        n = len(name)
        lst = []
        hit = 0
        for line in self.keys():
            if line[:n].lower() == name:
                hit = 1
            elif not line[:1].isspace():
                hit = 0
            if hit:
                lst.append(line)
        return lst

def parse_headers(fp, _class=HTTPMessage):
    """Parses only RFC2822 headers from a file pointer.

email Parser wants to see strings rather than bytes.
    But a TextIOWrapper around self.rfile would buffer too many bytes
    from the stream, bytes which we later need to read as bytes.
    So we read the correct bytes here, as bytes, for email Parser
    to parse.

"""
    headers = []
    while True:
        line = fp.readline(_MAXLINE + 1)
        if len(line) > _MAXLINE:
            raise LineTooLong("header line")
        headers.append(line)
        if len(headers) > _MAXHEADERS:
            raise HTTPException("got more than %d headers" % _MAXHEADERS)
        if line in (b'\r\n', b'\n', b''):
            break
    hstring = b''.join(headers).decode('iso-8859-1')
    return email.parser.Parser(_class=_class).parsestr(hstring)

class HTTPResponse(io.RawIOBase):

# See RFC 2616 sec 19.6 and RFC 1945 sec 6 for details.

# The bytes from the socket object are iso-8859-1 strings.
    # See RFC 2616 sec 2.2 which notes an exception for MIME-encoded
    # text following RFC 2047.  The basic status line parsing only
    # accepts iso-8859-1.

def __init__(self, sock, debuglevel=0, method=None, url=None):
        # If the response includes a content-length header, we need to
        # make sure that the client doesn't read more than the
        # specified number of bytes.  If it does, it will block until
        # the server times out and closes the connection.  This will
        # happen if a self.fp.read() is done (without a size) whether
        # self.fp is buffered or not.  So, no self.fp.read() by
        # clients unless they know what they are doing.
        self.fp = sock.makefile("rb")
        self.debuglevel = debuglevel
        self._method = method

# The HTTPResponse object is returned via urllib.  The clients
        # of http and urllib expect different attributes for the
        # headers.  headers is used here and supports urllib.  msg is
        # provided as a backwards compatibility layer for http
        # clients.

self.headers = self.msg = None

# from the Status-Line of the response
        self.version = _UNKNOWN # HTTP-Version
        self.status = _UNKNOWN  # Status-Code
        self.reason = _UNKNOWN  # Reason-Phrase

self.chunked = _UNKNOWN         # is "chunked" being used?
        self.chunk_left = _UNKNOWN      # bytes left to read in current chunk
        self.length = _UNKNOWN          # number of bytes left in response
        self.will_close = _UNKNOWN      # conn will close at end of response

def _read_status(self):
        line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
        if len(line) > _MAXLINE:
            raise LineTooLong("status line")
        if self.debuglevel > 0:
            print("reply:", repr(line))
        if not line:
            # Presumably, the server closed the connection before
            # sending a valid response.
            raise BadStatusLine(line)
        try:
            version, status, reason = line.split(None, 2)
        except ValueError:
            try:
                version, status = line.split(None, 1)
                reason = ""
            except ValueError:
                # empty version will cause next test to fail.
                version = ""
        if not version.startswith("HTTP/"):
            self._close_conn()
            raise BadStatusLine(line)

# The status code is a three-digit number
        try:
            status = int(status)
            if status < 100 or status > 999:
                raise BadStatusLine(line)
        except ValueError:
            raise BadStatusLine(line)
        return version, status, reason

def begin(self):
        if self.headers is not None:
            # we've already started reading the response
            return

# read until we get a non-100 response
        while True:
            version, status, reason = self._read_status()
            if status != CONTINUE:
                break
            # skip the header from the 100 response
            while True:
                skip = self.fp.readline(_MAXLINE + 1)
                if len(skip) > _MAXLINE:
                    raise LineTooLong("header line")
                skip = skip.strip()
                if not skip:
                    break
                if self.debuglevel > 0:
                    print("header:", skip)

self.code = self.status = status
        self.reason = reason.strip()
        if version in ("HTTP/1.0", "HTTP/0.9"):
            # Some servers might still return "0.9", treat it as 1.0 anyway
            self.version = 10
        elif version.startswith("HTTP/1."):
            self.version = 11   # use HTTP/1.1 code for HTTP/1.x where x>=1
        else:
            raise UnknownProtocol(version)

self.headers = self.msg = parse_headers(self.fp)

if self.debuglevel > 0:
            for hdr in self.headers:
                print("header:", hdr, end=" ")

# are we using the chunked-style of transfer encoding?
        tr_enc = self.headers.get("transfer-encoding")
        if tr_enc and tr_enc.lower() == "chunked":
            self.chunked = True
            self.chunk_left = None
        else:
            self.chunked = False

# will the connection close at the end of the response?
        self.will_close = self._check_close()

# do we have a Content-Length?
        # NOTE: RFC 2616, S4.4, #3 says we ignore this if tr_enc is "chunked"
        self.length = None
        length = self.headers.get("content-length")

# are we using the chunked-style of transfer encoding?
        tr_enc = self.headers.get("transfer-encoding")
        if length and not self.chunked:
            try:
                self.length = int(length)
            except ValueError:
                self.length = None
            else:
                if self.length < 0:  # ignore nonsensical negative lengths
                    self.length = None
        else:
            self.length = None

# does the body have a fixed length? (of zero)
        if (status == NO_CONTENT or status == NOT_MODIFIED or
            100 <= status < 200 or      # 1xx codes
            self._method == "HEAD"):
            self.length = 0

# if the connection remains open, and we aren't using chunked, and
        # a content-length was not provided, then assume that the connection
        # WILL close.
        if (not self.will_close and
            not self.chunked and
            self.length is None):
            self.will_close = True

def _check_close(self):
        conn = self.headers.get("connection")
        if self.version == 11:
            # An HTTP/1.1 proxy is assumed to stay open unless
            # explicitly closed.
            conn = self.headers.get("connection")
            if conn and "close" in conn.lower():
                return True
            return False

# Some HTTP/1.0 implementations have support for persistent
        # connections, using rules different than HTTP/1.1.

# For older HTTP, Keep-Alive indicates persistent connection.
        if self.headers.get("keep-alive"):
            return False

# At least Akamai returns a "Connection: Keep-Alive" header,
        # which was supposed to be sent by the client.
        if conn and "keep-alive" in conn.lower():
            return False

# Proxy-Connection is a netscape hack.
        pconn = self.headers.get("proxy-connection")
        if pconn and "keep-alive" in pconn.lower():
            return False

# otherwise, assume it will close
        return True

def _close_conn(self):
        fp = self.fp
        self.fp = None
        fp.close()

def close(self):
        try:
            super().close() # set "closed" flag
        finally:
            if self.fp:
                self._close_conn()

# These implementations are for the benefit of io.BufferedReader.

# XXX This class should probably be revised to act more like
    # the "raw stream" that BufferedReader expects.

def flush(self):
        super().flush()
        if self.fp:
            self.fp.flush()

def readable(self):
        return True

# End of "raw stream" methods

def isclosed(self):
        """True if the connection is closed."""
        # NOTE: it is possible that we will not ever call self.close(). This
        #       case occurs when will_close is TRUE, length is None, and we
        #       read up to the last byte, but NOT past it.
        #
        # IMPLIES: if will_close is FALSE, then self.close() will ALWAYS be
        #          called, meaning self.isclosed() is meaningful.
        return self.fp is None

def read(self, amt=None):
        if self.fp is None:
            return b""

if self._method == "HEAD":
            self._close_conn()
            return b""

if amt is not None:
            # Amount is given, so call base class version
            # (which is implemented in terms of self.readinto)
            return super(HTTPResponse, self).read(amt)
        else:
            # Amount is not given (unbounded read) so we must check self.length
            # and self.chunked

if self.chunked:
                return self._readall_chunked()

if self.length is None:
                s = self.fp.read()
            else:
                try:
                    s = self._safe_read(self.length)
                except IncompleteRead:
                    self._close_conn()
                    raise
                self.length = 0
            self._close_conn()        # we read everything
            return s

def readinto(self, b):
        if self.fp is None:
            return 0

if self._method == "HEAD":
            self._close_conn()
            return 0

if self.chunked:
            return self._readinto_chunked(b)

if self.length is not None:
            if len(b) > self.length:
                # clip the read to the "end of response"
                b = memoryview(b)[0:self.length]

# we do not use _safe_read() here because this may be a .will_close
        # connection, and the user is reading more bytes than will be provided
        # (for example, reading in 1k chunks)
        n = self.fp.readinto(b)
        if not n and b:
            # Ideally, we would raise IncompleteRead if the content-length
            # wasn't satisfied, but it might break compatibility.
            self._close_conn()
        elif self.length is not None:
            self.length -= n
            if not self.length:
                self._close_conn()
        return n

def _read_next_chunk_size(self):
        # Read the next chunk size from the file
        line = self.fp.readline(_MAXLINE + 1)
        if len(line) > _MAXLINE:
            raise LineTooLong("chunk size")
        i = line.find(b";")
        if i >= 0:
            line = line[:i] # strip chunk-extensions
        try:
            return int(line, 16)
        except ValueError:
            # close the connection as protocol synchronisation is
            # probably lost
            self._close_conn()
            raise

def _read_and_discard_trailer(self):
        # read and discard trailer up to the CRLF terminator
        ### note: we shouldn't have any trailers!
        while True:
            line = self.fp.readline(_MAXLINE + 1)
            if len(line) > _MAXLINE:
                raise LineTooLong("trailer line")
            if not line:
                # a vanishingly small number of sites EOF without
                # sending the trailer
                break
            if line in (b'\r\n', b'\n', b''):
                break

def _readall_chunked(self):
        assert self.chunked != _UNKNOWN
        chunk_left = self.chunk_left
        value = []
        while True:
            if chunk_left is None:
                try:
                    chunk_left = self._read_next_chunk_size()
                    if chunk_left == 0:
                        break
                except ValueError:
                    raise IncompleteRead(b''.join(value))
            value.append(self._safe_read(chunk_left))

# we read the whole chunk, get another
            self._safe_read(2)      # toss the CRLF at the end of the chunk
            chunk_left = None

self._read_and_discard_trailer()

# we read everything; close the "file"
        self._close_conn()

return b''.join(value)

def _readinto_chunked(self, b):
        assert self.chunked != _UNKNOWN
        chunk_left = self.chunk_left

total_bytes = 0
        mvb = memoryview(b)
        while True:
            if chunk_left is None:
                try:
                    chunk_left = self._read_next_chunk_size()
                    if chunk_left == 0:
                        break
                except ValueError:
                    raise IncompleteRead(bytes(b[0:total_bytes]))

if len(mvb) < chunk_left:
                n = self._safe_readinto(mvb)
                self.chunk_left = chunk_left - n
                return total_bytes + n
            elif len(mvb) == chunk_left:
                n = self._safe_readinto(mvb)
                self._safe_read(2)  # toss the CRLF at the end of the chunk
                self.chunk_left = None
                return total_bytes + n
            else:
                temp_mvb = mvb[0:chunk_left]
                n = self._safe_readinto(temp_mvb)
                mvb = mvb[n:]
                total_bytes += n

# we read the whole chunk, get another
            self._safe_read(2)      # toss the CRLF at the end of the chunk
            chunk_left = None

self._read_and_discard_trailer()

# we read everything; close the "file"
        self._close_conn()

return total_bytes

def _safe_read(self, amt):
        """Read the number of bytes requested, compensating for partial reads.

Normally, we have a blocking socket, but a read() can be interrupted
        by a signal (resulting in a partial read).

Note that we cannot distinguish between EOF and an interrupt when zero
        bytes have been read. IncompleteRead() will be raised in this
        situation.

This function should be used when <amt> bytes "should" be present for
        reading. If the bytes are truly not available (due to EOF), then the
        IncompleteRead exception can be used to detect the problem.
        """
        s = []
        while amt > 0:
            chunk = self.fp.read(min(amt, MAXAMOUNT))
            if not chunk:
                raise IncompleteRead(b''.join(s), amt)
            s.append(chunk)
            amt -= len(chunk)
        return b"".join(s)

def _safe_readinto(self, b):
        """Same as _safe_read, but for reading into a buffer."""
        total_bytes = 0
        mvb = memoryview(b)
        while total_bytes < len(b):
            if MAXAMOUNT < len(mvb):
                temp_mvb = mvb[0:MAXAMOUNT]
                n = self.fp.readinto(temp_mvb)
            else:
                n = self.fp.readinto(mvb)
            if not n:
                raise IncompleteRead(bytes(mvb[0:total_bytes]), len(b))
            mvb = mvb[n:]
            total_bytes += n
        return total_bytes

def fileno(self):
        return self.fp.fileno()

def getheader(self, name, default=None):
        if self.headers is None:
            raise ResponseNotReady()
        headers = self.headers.get_all(name) or default
        if isinstance(headers, str) or not hasattr(headers, '__iter__'):
            return headers
        else:
            return ', '.join(headers)

def getheaders(self):
        """Return list of (header, value) tuples."""
        if self.headers is None:
            raise ResponseNotReady()
        return list(self.headers.items())

# We override IOBase.__iter__ so that it doesn't check for closed-ness

def __iter__(self):
        return self

# For compatibility with old-style urllib responses.

def info(self):
        return self.headers

def geturl(self):
        return self.url

def getcode(self):
        return self.status

class HTTPConnection:

_http_vsn = 11
    _http_vsn_str = 'HTTP/1.1'

response_class = HTTPResponse
    default_port = HTTP_PORT
    auto_open = 1
    debuglevel = 0
    # TCP Maximum Segment Size (MSS) is determined by the TCP stack on
    # a per-connection basis.  There is no simple and efficient
    # platform independent mechanism for determining the MSS, so
    # instead a reasonable estimate is chosen.  The getsockopt()
    # interface using the TCP_MAXSEG parameter may be a suitable
    # approach on some operating systems. A value of 16KiB is chosen
    # as a reasonable estimate of the maximum MSS.
    mss = 16384

def __init__(self, host, port=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
                 source_address=None):
        self.timeout = timeout
        self.source_address = source_address
        self.sock = None
        self._buffer = []
        self.__response = None
        self.__state = _CS_IDLE
        self._method = None
        self._tunnel_host = None
        self._tunnel_port = None
        self._tunnel_headers = {}

(self.host, self.port) = self._get_hostport(host, port)

# This is stored as an instance variable to allow unit
        # tests to replace it with a suitable mockup
        self._create_connection = socket.create_connection

def set_tunnel(self, host, port=None, headers=None):
        """Set up host and port for HTTP CONNECT tunnelling.

In a connection that uses HTTP CONNECT tunneling, the host passed to the
        constructor is used as a proxy server that relays all communication to
        the endpoint passed to `set_tunnel`. This done by sending an HTTP
        CONNECT request to the proxy server when the connection is established.

This method must be called before the HTML connection has been
        established.

The headers argument should be a mapping of extra HTTP headers to send
        with the CONNECT request.
        """

if self.sock:
            raise RuntimeError("Can't set up tunnel for established connection")

self._tunnel_host, self._tunnel_port = self._get_hostport(host, port)
        if headers:
            self._tunnel_headers = headers
        else:
            self._tunnel_headers.clear()

def _get_hostport(self, host, port):
        if port is None:
            i = host.rfind(':')
            j = host.rfind(']')         # ipv6 addresses have [...]
            if i > j:
                try:
                    port = int(host[i+1:])
                except ValueError:
                    if host[i+1:] == "": # http://foo.com:/ == http://foo.com/
                        port = self.default_port
                    else:
                        raise InvalidURL("nonnumeric port: '%s'" % host[i+1:])
                host = host[:i]
            else:
                port = self.default_port
            if host and host[0] == '[' and host[-1] == ']':
                host = host[1:-1]

return (host, port)

def set_debuglevel(self, level):
        self.debuglevel = level

def _tunnel(self):
        connect_str = "CONNECT %s:%d HTTP/1.0\r\n" % (self._tunnel_host,
            self._tunnel_port)
        connect_bytes = connect_str.encode("ascii")
        self.send(connect_bytes)
        for header, value in self._tunnel_headers.items():
            header_str = "%s: %s\r\n" % (header, value)
            header_bytes = header_str.encode("latin-1")
            self.send(header_bytes)
        self.send(b'\r\n')

response = self.response_class(self.sock, method=self._method)
        (version, code, message) = response._read_status()

if code != 200:
            self.close()
            raise OSError("Tunnel connection failed: %d %s" % (code,
                                                               message.strip()))
        while True:
            line = response.fp.readline(_MAXLINE + 1)
            if len(line) > _MAXLINE:
                raise LineTooLong("header line")
            if not line:
                # for sites which EOF without sending a trailer
                break
            if line in (b'\r\n', b'\n', b''):
                break

def connect(self):
        """Connect to the host and port specified in __init__."""
        self.sock = self._create_connection((self.host,self.port),
                                            self.timeout, self.source_address)

if self._tunnel_host:
            self._tunnel()

def close(self):
        """Close the connection to the HTTP server."""
        self.__state = _CS_IDLE
        try:
            sock = self.sock
            if sock:
                self.sock = None
                sock.close()   # close it manually... there may be other refs
        finally:
            response = self.__response
            if response:
                self.__response = None
                response.close()

def send(self, data):
        """Send `data' to the server.
        ``data`` can be a string object, a bytes object, an array object, a
        file-like object that supports a .read() method, or an iterable object.
        """

if self.sock is None:
            if self.auto_open:
                self.connect()
            else:
                raise NotConnected()

if self.debuglevel > 0:
            print("send:", repr(data))
        blocksize = 8192
        if hasattr(data, "read") :
            if self.debuglevel > 0:
                print("sendIng a read()able")
            encode = False
            try:
                mode = data.mode
            except AttributeError:
                # io.BytesIO and other file-like objects don't have a `mode`
                # attribute.
                pass
            else:
                if "b" not in mode:
                    encode = True
                    if self.debuglevel > 0:
                        print("encoding file using iso-8859-1")
            while 1:
                datablock = data.read(blocksize)
                if not datablock:
                    break
                if encode:
                    datablock = datablock.encode("iso-8859-1")
                self.sock.sendall(datablock)
            return
        try:
            self.sock.sendall(data)
        except TypeError:
            if isinstance(data, collections.Iterable):
                for d in data:
                    self.sock.sendall(d)
            else:
                raise TypeError("data should be a bytes-like object "
                                "or an iterable, got %r" % type(data))

def _output(self, s):
        """Add a line of output to the current request buffer.

Assumes that the line does *not* end with \\r\\n.
        """
        self._buffer.append(s)

def _send_output(self, message_body=None):
        """Send the currently buffered request and clear the buffer.

Appends an extra \\r\\n to the buffer.
        A message_body may be specified, to be appended to the request.
        """
        self._buffer.extend((b"", b""))
        msg = b"\r\n".join(self._buffer)
        del self._buffer[:]
        # If msg and message_body are sent in a single send() call,
        # it will avoid performance problems caused by the interaction
        # between delayed ack and the Nagle algorithm. However,
        # there is no performance gain if the message is larger
        # than MSS (and there is a memory penalty for the message
        # copy).
        if isinstance(message_body, bytes) and len(message_body) < self.mss:
            msg += message_body
            message_body = None
        self.send(msg)
        if message_body is not None:
            # message_body was not a string (i.e. it is a file), and
            # we must run the risk of Nagle.
            self.send(message_body)

def putrequest(self, method, url, skip_host=0, skip_accept_encoding=0):
        """Send a request to the server.

`method' specifies an HTTP request method, e.g. 'GET'.
        `url' specifies the object being requested, e.g. '/index.html'.
        `skip_host' if True does not add automatically a 'Host:' header
        `skip_accept_encoding' if True does not add automatically an
           'Accept-Encoding:' header
        """

# if a prior response has been completed, then forget about it.
        if self.__response and self.__response.isclosed():
            self.__response = None

# in certain cases, we cannot issue another request on this connection.
        # this occurs when:
        #   1) we are in the process of sending a request.   (_CS_REQ_STARTED)
        #   2) a response to a previous request has signalled that it is going
        #      to close the connection upon completion.
        #   3) the headers for the previous response have not been read, thus
        #      we cannot determine whether point (2) is true.   (_CS_REQ_SENT)
        #
        # if there is no prior response, then we can request at will.
        #
        # if point (2) is true, then we will have passed the socket to the
        # response (effectively meaning, "there is no prior response"), and
        # will open a new one when a new request is made.
        #
        # Note: if a prior response exists, then we *can* start a new request.
        #       We are not allowed to begin fetching the response to this new
        #       request, however, until that prior response is complete.
        #
        if self.__state == _CS_IDLE:
            self.__state = _CS_REQ_STARTED
        else:
            raise CannotSendRequest(self.__state)

# Save the method we use, we need it later in the response phase
        self._method = method
        if not url:
            url = '/'
        request = '%s %s %s' % (method, url, self._http_vsn_str)

# Non-ASCII characters should have been eliminated earlier
        self._output(request.encode('ascii'))

if self._http_vsn == 11:
            # Issue some standard headers for better HTTP/1.1 compliance

if not skip_host:
                # this header is issued *only* for HTTP/1.1
                # connections. more specifically, this means it is
                # only issued when the client uses the new
                # HTTPConnection() class. backwards-compat clients
                # will be using HTTP/1.0 and those clients may be
                # issuing this header themselves. we should NOT issue
                # it twice; some web servers (such as Apache) barf
                # when they see two Host: headers

# If we need a non-standard port,include it in the
                # header.  If the request is going through a proxy,
                # but the host of the actual URL, not the host of the
                # proxy.

netloc = ''
                if url.startswith('http'):
                    nil, netloc, nil, nil, nil = urlsplit(url)

if netloc:
                    try:
                        netloc_enc = netloc.encode("ascii")
                    except UnicodeEncodeError:
                        netloc_enc = netloc.encode("idna")
                    self.putheader('Host', netloc_enc)
                else:
                    if self._tunnel_host:
                        host = self._tunnel_host
                        port = self._tunnel_port
                    else:
                        host = self.host
                        port = self.port

try:
                        host_enc = host.encode("ascii")
                    except UnicodeEncodeError:
                        host_enc = host.encode("idna")

# As per RFC 273, IPv6 address should be wrapped with []
                    # when used as Host header

if host.find(':') >= 0:
                        host_enc = b'[' + host_enc + b']'

if port == self.default_port:
                        self.putheader('Host', host_enc)
                    else:
                        host_enc = host_enc.decode("ascii")
                        self.putheader('Host', "%s:%s" % (host_enc, port))

# note: we are assuming that clients will not attempt to set these
            #       headers since *this* library must deal with the
            #       consequences. this also means that when the supporting
            #       libraries are updated to recognize other forms, then this
            #       code should be changed (removed or updated).

# we only want a Content-Encoding of "identity" since we don't
            # support encodings such as x-gzip or x-deflate.
            if not skip_accept_encoding:
                self.putheader('Accept-Encoding', 'identity')

# we can accept "chunked" Transfer-Encodings, but no others
            # NOTE: no TE header implies *only* "chunked"
            #self.putheader('TE', 'chunked')

# if TE is supplied in the header, then it must appear in a
            # Connection header.
            #self.putheader('Connection', 'TE')

else:
            # For HTTP/1.0, the server will assume "not chunked"
            pass

def putheader(self, header, *values):
        """Send a request header line to the server.

For example: h.putheader('Accept', 'text/html')
        """
        if self.__state != _CS_REQ_STARTED:
            raise CannotSendHeader()

if hasattr(header, 'encode'):
            header = header.encode('ascii')

if not _is_legal_header_name(header):
            raise ValueError('Invalid header name %r' % (header,))

values = list(values)
        for i, one_value in enumerate(values):
            if hasattr(one_value, 'encode'):
                values[i] = one_value.encode('latin-1')
            elif isinstance(one_value, int):
                values[i] = str(one_value).encode('ascii')

if _is_illegal_header_value(values[i]):
                raise ValueError('Invalid header value %r' % (values[i],))

value = b'\r\n\t'.join(values)
        header = header + b': ' + value
        self._output(header)

def endheaders(self, message_body=None):
        """Indicate that the last header line has been sent to the server.

This method sends the request to the server.  The optional message_body
        argument can be used to pass a message body associated with the
        request.  The message body will be sent in the same packet as the
        message headers if it is a string, otherwise it is sent as a separate
        packet.
        """
        if self.__state == _CS_REQ_STARTED:
            self.__state = _CS_REQ_SENT
        else:
            raise CannotSendHeader()
        self._send_output(message_body)

def request(self, method, url, body=None, headers={}):
        """Send a complete request to the server."""
        self._send_request(method, url, body, headers)

def _set_content_length(self, body, method):
        # Set the content-length based on the body. If the body is "empty", we
        # set Content-Length: 0 for methods that expect a body (RFC 7230,
        # Section 3.3.2). If the body is set for other methods, we set the
        # header provided we can figure out what the length is.
        thelen = None
        method_expects_body = method.upper() in _METHODS_EXPECTING_BODY
        if body is None and method_expects_body:
            thelen = '0'
        elif body is not None:
            try:
                thelen = str(len(body))
            except TypeError:
                # If this is a file-like object, try to
                # fstat its file descriptor
                try:
                    thelen = str(os.fstat(body.fileno()).st_size)
                except (AttributeError, OSError):
                    # Don't send a length if this failed
                    if self.debuglevel > 0: print("Cannot stat!!")

if thelen is not None:
            self.putheader('Content-Length', thelen)

def _send_request(self, method, url, body, headers):
        # Honor explicitly requested Host: and Accept-Encoding: headers.
        header_names = dict.fromkeys([k.lower() for k in headers])
        skips = {}
        if 'host' in header_names:
            skips['skip_host'] = 1
        if 'accept-encoding' in header_names:
            skips['skip_accept_encoding'] = 1

self.putrequest(method, url, **skips)

if 'content-length' not in header_names:
            self._set_content_length(body, method)
        for hdr, value in headers.items():
            self.putheader(hdr, value)
        if isinstance(body, str):
            # RFC 2616 Section 3.7.1 says that text default has a
            # default charset of iso-8859-1.
            body = body.encode('iso-8859-1')
        self.endheaders(body)

def getresponse(self):
        """Get the response from the server.

If the HTTPConnection is in the correct state, returns an
        instance of HTTPResponse or of whatever object is returned by
        class the response_class variable.

If a request has not been sent or if a previous response has
        not be handled, ResponseNotReady is raised.  If the HTTP
        response indicates that the connection should be closed, then
        it will be closed before the response is returned.  When the
        connection is closed, the underlying socket is closed.
        """

# if a prior response has been completed, then forget about it.
        if self.__response and self.__response.isclosed():
            self.__response = None

# if a prior response exists, then it must be completed (otherwise, we
        # cannot read this response's header to determine the connection-close
        # behavior)
        #
        # note: if a prior response existed, but was connection-close, then the
        # socket and response were made independent of this HTTPConnection
        # object since a new request requires that we open a whole new
        # connection
        #
        # this means the prior response had one of two states:
        #   1) will_close: this connection was reset and the prior socket and
        #                  response operate independently
        #   2) persistent: the response was retained and we await its
        #                  isclosed() status to become true.
        #
        if self.__state != _CS_REQ_SENT or self.__response:
            raise ResponseNotReady(self.__state)

if self.debuglevel > 0:
            response = self.response_class(self.sock, self.debuglevel,
                                           method=self._method)
        else:
            response = self.response_class(self.sock, method=self._method)

try:
            response.begin()
            assert response.will_close != _UNKNOWN
            self.__state = _CS_IDLE

if response.will_close:
                # this effectively passes the connection to the response
                self.close()
            else:
                # remember this, so we can tell when it is complete
                self.__response = response

return response
        except:
            response.close()
            raise

try:
    import ssl
except ImportError:
    pass
else:
    class HTTPSConnection(HTTPConnection):
        "This class allows communication via SSL."

default_port = HTTPS_PORT

# XXX Should key_file and cert_file be deprecated in favour of context?

def __init__(self, host, port=None, key_file=None, cert_file=None,
                     timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
                     source_address=None, *, context=None,
                     check_hostname=None):
            super(HTTPSConnection, self).__init__(host, port, timeout,
                                                  source_address)
            self.key_file = key_file
            self.cert_file = cert_file
            if context is None:
                context = ssl._create_default_https_context()
            will_verify = context.verify_mode != ssl.CERT_NONE
            if check_hostname is None:
                check_hostname = context.check_hostname
            if check_hostname and not will_verify:
                raise ValueError("check_hostname needs a SSL context with "
                                 "either CERT_OPTIONAL or CERT_REQUIRED")
            if key_file or cert_file:
                context.load_cert_chain(cert_file, key_file)
            self._context = context
            self._check_hostname = check_hostname

def connect(self):
            "Connect to a host on a given (SSL) port."

super().connect()

if self._tunnel_host:
                server_hostname = self._tunnel_host
            else:
                server_hostname = self.host

self.sock = self._context.wrap_socket(self.sock,
                                                  server_hostname=server_hostname)
            if not self._context.check_hostname and self._check_hostname:
                try:
                    ssl.match_hostname(self.sock.getpeercert(), server_hostname)
                except Exception:
                    self.sock.shutdown(socket.SHUT_RDWR)
                    self.sock.close()
                    raise

__all__.append("HTTPSConnection")

class HTTPException(Exception):
    # Subclasses that define an __init__ must call Exception.__init__
    # or define self.args.  Otherwise, str() will fail.
    pass

class NotConnected(HTTPException):
    pass

class InvalidURL(HTTPException):
    pass

class UnknownProtocol(HTTPException):
    def __init__(self, version):
        self.args = version,
        self.version = version

class UnknownTransferEncoding(HTTPException):
    pass

class UnimplementedFileMode(HTTPException):
    pass

class IncompleteRead(HTTPException):
    def __init__(self, partial, expected=None):
        self.args = partial,
        self.partial = partial
        self.expected = expected
    def __repr__(self):
        if self.expected is not None:
            e = ', %i more expected' % self.expected
        else:
            e = ''
        return 'IncompleteRead(%i bytes read%s)' % (len(self.partial), e)
    def __str__(self):
        return repr(self)

class ImproperConnectionState(HTTPException):
    pass

class CannotSendRequest(ImproperConnectionState):
    pass

class CannotSendHeader(ImproperConnectionState):
    pass

class ResponseNotReady(ImproperConnectionState):
    pass

class BadStatusLine(HTTPException):
    def __init__(self, line):
        if not line:
            line = repr(line)
        self.args = line,
        self.line = line

class LineTooLong(HTTPException):
    def __init__(self, line_type):
        HTTPException.__init__(self, "got more than %d bytes when reading %s"
                                     % (_MAXLINE, line_type))

# for backwards compatibility
error = HTTPException

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