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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
|\_____________________________
| | getresponse() raises
| response = getresponse() | ConnectionError
v v
Unread-response Idle
[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>
N)urlsplit) HTTPResponseHTTPConnection
HTTPException NotConnectedUnknownProtocolUnknownTransferEncodingUnimplementedFileModeIncompleteRead
InvalidURLImproperConnectionStateCannotSendRequestCannotSendHeaderResponseNotReady
BadStatusLine LineTooLongRemoteDisconnectederror responsesP i UNKNOWNIdlezRequest-startedz Request-sentc i | ]
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_read_headersrZ s G{{8a<(( t99x m,, ,t w<<+ % % :[ HII I ( ( ( Nr c t | }d | d }t j | | S )aG Parses only RFC2822 headers from a file pointer.
email Parser wants to see strings rather than bytes.
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%%c 4 | j S r )rX filenor s r r zHTTPResponse.fileno s w~~ r c | j t | j | p|}t |t st |d s|S d | S )ax Returns the value of the header matching *name*.
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getheaderszHTTPResponse.getheaders s2 < "$$ $DL&&(()))r c | S r r r s r r zHTTPResponse.__iter__ s r c | j S )aj Returns an instance of the class mimetools.Message containing
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guessed.
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a Date representing the file's last-modified time, a
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)rY r s r infozHTTPResponse.info s * |r c | j S )aZ Return the real URL of the page.
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)rw r s r geturlzHTTPResponse.geturl s xr c | j S )zuReturn the HTTP status code that was sent with the response,
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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.
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established.
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with the CONNECT request.
z.Can't set up tunnel for established connectionN)ru RuntimeErrorr r r r clear)rG r r rY s r
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Nr zsend:r zsending a readable encoding file using iso-8859-1rA r\ zhttp.client.sendz9data should be a bytes-like object or an iterable, got %r)ru auto_openr+ r rj r} r~ r r r r r( r1 r2 sendallr r collectionsabcIterabletype)rG r% r( datablockds r r% zHTTPConnection.send s 9 ~
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