"""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 Req-started-unread-response _CS_REQ_STARTED Req-sent-unread-response _CS_REQ_SENT """ import io import socket import email.parser import email.message from urllib.parse import urlsplit import warnings __all__ = ["HTTPResponse", "HTTPConnection", "HTTPException", "NotConnected", "UnknownProtocol", "UnknownTransferEncoding", "UnimplementedFileMode", "IncompleteRead", "InvalidURL", "ImproperConnectionState", "CannotSendRequest", "CannotSendHeader", "ResponseNotReady", "BadStatusLine", "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 # 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 # 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', 500: 'Internal Server Error', 501: 'Not Implemented', 502: 'Bad Gateway', 503: 'Service Unavailable', 504: 'Gateway Timeout', 505: 'HTTP Version Not Supported', } # maximal amount of data to read at one time in _safe_read MAXAMOUNT = 1048576 class HTTPMessage(email.message.Message): 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. """ # XXX: copied from rfc822.Message for compatibility 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): """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. """ # XXX: Copied from http.server.BaseHTTPRequestHandler.parse_request, # maybe we can just call this function from there. headers = [] while True: line = fp.readline() headers.append(line) if line in (b'\r\n', b'\n', b''): break hstring = b''.join(headers).decode('iso-8859-1') return email.parser.Parser(_class=HTTPMessage).parsestr(hstring) class HTTPResponse: # strict: If true, raise BadStatusLine if the status line can't be # parsed as a valid HTTP/1.0 or 1.1 status line. By default it is # false because it prevents clients from talking to HTTP/0.9 # servers. Note that a response with a sufficiently corrupted # status line will look like an HTTP/0.9 response. # 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, strict=0, method=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. (The only # applies to HTTP/1.1 connections.) 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.strict = strict self._method = method 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): # Initialize with Simple-Response defaults. line = str(self.fp.readline(), "iso-8859-1") 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 and status # will be treated as 0.9 response. version = "" if not version.startswith("HTTP/"): if self.strict: self.close() raise BadStatusLine(line) else: # Assume it's a Simple-Response from an 0.9 server. # We have to convert the first line back to raw bytes # because self.fp.readline() needs to return bytes. self.fp = LineAndFileWrapper(bytes(line, "ascii"), self.fp) return "HTTP/0.9", 200, "" # 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.msg 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().strip() if not skip: break if self.debuglevel > 0: print("header:", skip) self.status = status self.reason = reason.strip() if version == "HTTP/1.0": self.version = 10 elif version.startswith("HTTP/1."): self.version = 11 # use HTTP/1.1 code for HTTP/1.x where x>=1 elif version == "HTTP/0.9": self.version = 9 else: raise UnknownProtocol(version) if self.version == 9: self.length = None self.chunked = False self.will_close = True self.msg = email.message_from_string('') return self.msg = parse_headers(self.fp) if self.debuglevel > 0: for hdr in self.msg: print("header:", hdr, end=" ") # are we using the chunked-style of transfer encoding? tr_enc = self.msg.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.msg.get("content-length") # are we using the chunked-style of transfer encoding? tr_enc = self.msg.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.msg.get("connection") if self.version == 11: # An HTTP/1.1 proxy is assumed to stay open unless # explicitly closed. conn = self.msg.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.msg.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.msg.get("proxy-connection") if pconn and "keep-alive" in pconn.lower(): return False # otherwise, assume it will close return True def close(self): if self.fp: self.fp.close() self.fp = None # 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. @property def closed(self): return self.isclosed() def flush(self): self.fp.flush() # End of "raw stream" methods def isclosed(self): # 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 # XXX It would be nice to have readline and __iter__ for this, too. def read(self, amt=None): if self.fp is None: return b"" if self.chunked: return self._read_chunked(amt) if amt is None: # unbounded read if self.length is None: s = self.fp.read() else: s = self._safe_read(self.length) self.length = 0 self.close() # we read everything return s if self.length is not None: if amt > self.length: # clip the read to the "end of response" amt = 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) s = self.fp.read(amt) if self.length is not None: self.length -= len(s) if not self.length: self.close() return s def _read_chunked(self, amt): assert self.chunked != _UNKNOWN chunk_left = self.chunk_left value = b"" # XXX This accumulates chunks by repeated string concatenation, # which is not efficient as the number or size of chunks gets big. while True: if chunk_left is None: line = self.fp.readline() i = line.find(b";") if i >= 0: line = line[:i] # strip chunk-extensions try: chunk_left = int(line, 16) except ValueError: # close the connection as protocol synchronisation is # probably lost self.close() raise IncompleteRead(value) if chunk_left == 0: break if amt is None: value += self._safe_read(chunk_left) elif amt < chunk_left: value += self._safe_read(amt) self.chunk_left = chunk_left - amt return value elif amt == chunk_left: value += self._safe_read(amt) self._safe_read(2) # toss the CRLF at the end of the chunk self.chunk_left = None return value else: value += self._safe_read(chunk_left) amt -= 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 # read and discard trailer up to the CRLF terminator ### note: we shouldn't have any trailers! while True: line = self.fp.readline() if not line: # a vanishingly small number of sites EOF without # sending the trailer break if line == b"\r\n": break # we read everything; close the "file" self.close() return value 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 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(s) s.append(chunk) amt -= len(chunk) return b"".join(s) def getheader(self, name, default=None): if self.msg is None: raise ResponseNotReady() return ', '.join(self.msg.get_all(name, default)) def getheaders(self): """Return list of (header, value) tuples.""" if self.msg is None: raise ResponseNotReady() return list(self.msg.items()) class HTTPConnection: _http_vsn = 11 _http_vsn_str = 'HTTP/1.1' response_class = HTTPResponse default_port = HTTP_PORT auto_open = 1 debuglevel = 0 strict = 0 def __init__(self, host, port=None, strict=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT): self.timeout = timeout self.sock = None self._buffer = [] self.__response = None self.__state = _CS_IDLE self._method = None self._set_hostport(host, port) if strict is not None: self.strict = strict def _set_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: 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] self.host = host self.port = port def set_debuglevel(self, level): self.debuglevel = level def connect(self): """Connect to the host and port specified in __init__.""" self.sock = socket.create_connection((self.host,self.port), self.timeout) def close(self): """Close the connection to the HTTP server.""" if self.sock: self.sock.close() # close it manually... there may be other refs self.sock = None if self.__response: self.__response.close() self.__response = None self.__state = _CS_IDLE def send(self, str): """Send `str' to the server.""" if self.sock is None: if self.auto_open: self.connect() else: raise NotConnected() # send the data to the server. if we get a broken pipe, then close # the socket. we want to reconnect when somebody tries to send again. # # NOTE: we DO propagate the error, though, because we cannot simply # ignore the error... the caller will know if they can retry. if self.debuglevel > 0: print("send:", repr(str)) try: blocksize=8192 if hasattr(str,'read') : if self.debuglevel > 0: print("sendIng a read()able") data=str.read(blocksize) while data: self.sock.sendall(data) data=str.read(blocksize) else: self.sock.sendall(str) except socket.error as v: if v.args[0] == 32: # Broken pipe self.close() raise 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 algorithim. if isinstance(message_body, bytes): 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() # 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: try: host_enc = self.host.encode("ascii") except UnicodeEncodeError: host_enc = self.host.encode("idna") if self.port == self.default_port: self.putheader('Host', host_enc) else: host_enc = host_enc.decode("ascii") self.putheader('Host', "%s:%s" % (host_enc, self.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') values = list(values) for i, one_value in enumerate(values): if hasattr(one_value, 'encode'): values[i] = one_value.encode('ascii') 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 message body associated with the request. The message body will be sent in the same packet as the message headers if possible. The message_body should be a string. """ 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.""" try: self._send_request(method, url, body, headers) except socket.error as v: # trap 'Broken pipe' if we're allowed to automatically reconnect if v.args[0] != 32 or not self.auto_open: raise # try one more time self._send_request(method, url, body, headers) def _set_content_length(self, body): # Set the content-length based on the body. thelen = None try: thelen = str(len(body)) except TypeError as te: # If this is a file-like object, try to # fstat its file descriptor import os 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): # honour 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 body and ('content-length' not in header_names): self._set_content_length(body) for hdr, value in headers.items(): self.putheader(hdr, value) self.endheaders(body.encode('ascii') if isinstance(body, str) else body) def getresponse(self): """Get the response from the server.""" # 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() if self.debuglevel > 0: response = self.response_class(self.sock, self.debuglevel, strict=self.strict, method=self._method) else: response = self.response_class(self.sock, strict=self.strict, method=self._method) 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 try: import ssl except ImportError: pass else: class HTTPSConnection(HTTPConnection): "This class allows communication via SSL." default_port = HTTPS_PORT def __init__(self, host, port=None, key_file=None, cert_file=None, strict=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT): HTTPConnection.__init__(self, host, port, strict, timeout) self.key_file = key_file self.cert_file = cert_file def connect(self): "Connect to a host on a given (SSL) port." sock = socket.create_connection((self.host, self.port), self.timeout) self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file) def FakeSocket (sock, sslobj): warnings.warn("FakeSocket is deprecated, and won't be in 3.x. " + "Use the result of ssl.wrap_socket() directly instead.", DeprecationWarning, stacklevel=2) return sslobj __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): self.args = partial, self.partial = partial class ImproperConnectionState(HTTPException): pass class CannotSendRequest(ImproperConnectionState): pass class CannotSendHeader(ImproperConnectionState): pass class ResponseNotReady(ImproperConnectionState): pass class BadStatusLine(HTTPException): def __init__(self, line): self.args = line, self.line = line # for backwards compatibility error = HTTPException class LineAndFileWrapper: """A limited file-like object for HTTP/0.9 responses.""" # The status-line parsing code calls readline(), which normally # get the HTTP status line. For a 0.9 response, however, this is # actually the first line of the body! Clients need to get a # readable file object that contains that line. def __init__(self, line, file): self._line = line self._file = file self._line_consumed = 0 self._line_offset = 0 self._line_left = len(line) def __getattr__(self, attr): return getattr(self._file, attr) def _done(self): # called when the last byte is read from the line. After the # call, all read methods are delegated to the underlying file # object. self._line_consumed = 1 self.read = self._file.read self.readline = self._file.readline self.readlines = self._file.readlines def read(self, amt=None): if self._line_consumed: return self._file.read(amt) assert self._line_left if amt is None or amt > self._line_left: s = self._line[self._line_offset:] self._done() if amt is None: return s + self._file.read() else: return s + self._file.read(amt - len(s)) else: assert amt <= self._line_left i = self._line_offset j = i + amt s = self._line[i:j] self._line_offset = j self._line_left -= amt if self._line_left == 0: self._done() return s def readline(self): if self._line_consumed: return self._file.readline() assert self._line_left s = self._line[self._line_offset:] self._done() return s def readlines(self, size=None): if self._line_consumed: return self._file.readlines(size) assert self._line_left L = [self._line[self._line_offset:]] self._done() if size is None: return L + self._file.readlines() else: return L + self._file.readlines(size)