File: //usr/lib/python3.5/http/__pycache__/client.cpython-35.pyc
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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 ZUNKNOWNZIdlezRequest-startedz Request-sentc C s i | ] } | j | q S )phrase).0vr r !/usr/lib/python3.5/http/client.py
<dictcomp>k s r i i d s [^:\s][^:\r\n]*s \n(?![ \t])|\r(?![ \t\n])z[ - ]z[ - ]ZPATCHZPOSTZPUTdatac C s y | j d SWno t k
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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.
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_read_headers s
r? c C s@ t | } d j | j d } t j j d | j | S)aG Parses only RFC2822 headers from a file pointer.
email Parser wants to see strings rather than bytes.
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to parse.
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z HTTPResponse._readinto_chunkedc C s| g } xf | d k rn | j j t | t } | sN t d j | | | j | | t | 8} q Wd j | S)aV 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.
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reading. If the bytes are truly not available (due to EOF), then the
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_get_hostporthostport_validate_hostsocketZcreate_connection_create_connection)r0 r r r r r r r rU s zHTTPConnection.__init__c C sV | j r t d | j | | \ | _ | _ | rE | | _ n
| j j d S)aD 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.
z.Can't set up tunnel for established connectionN)rR RuntimeErrorr r r r clear)r0 r r r> r r r
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zHTTPConnection._tunnelc C s] | j | j | j f | j | j | _ | j j t j t j d | j
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$ zHTTPConnection.connectc C sY t | _ z& | j } | r. d | _ | j Wd | j } | rT d | _ | j Xd S)z(Close the connection to the HTTP server.N)r r rR rn r )r0 rR r r r r rn j s zHTTPConnection.closec C s | j d k r. | j r% | j n t | j d k rP t d t | d } t | d r| j d k r~ t d d } y
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zHTTPConnection.sendc C s | j j | d S)zuAdd a line of output to the current request buffer.
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f | s)| j d d n d S)a` 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
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| j d S)Nr )r )r0 r r r r r < s z HTTPConnection._encode_requestc C s5 t j | } | r1 t d | | j f d S)z&Validate a method name for putrequest.z?method can't contain control characters. %r (found at least %r)N)$_contains_disallowed_method_pchar_researchr\ group)r0 rS matchr r r r @ s
z HTTPConnection._validate_methodc C sC t j | } | r? d j d | j t } t | d S)z Validate a url for putrequest.zJURL can't contain control characters. {url!r} (found at least {matched!r})matchedN)!_contains_disallowed_url_pchar_rer formatr localsr )r0 rT r rI r r r r J s
z HTTPConnection._validate_pathc C sC t j | } | r? d j d | j d | } t | d S)z9Validate a host so it doesn't contain control characters.zKURL can't contain control characters. {host!r} (found at least {matched!r})r r N)r r r r r )r0 r r rI r r r r U s
z HTTPConnection._validate_hostc G s | j t k r t t | d r6 | j d } t | sU t d | f t | } x t | D] \ } } t | d r | j d | | <n( t | t
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| } | d | } | j | d S) zkSend a request header line to the server.
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r r zInvalid header name %rzlatin-1zInvalid header value %rs
s : N)r r r r r _is_legal_header_namer\ r enumerater r_ rX _is_illegal_header_valuerA r )r0 r valuesr Z one_valuer r r r r ` s" zHTTPConnection.putheaderc C s5 | j t k r t | _ n t | j | d S)a 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.
N)r r _CS_REQ_SENTr r )r0 r r r r
endheaders| s zHTTPConnection.endheadersc C s | j | | | | d S)z&Send a complete request to the server.N)
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z HTTPConnection._send_requestc C s' | j r! | j j r! d | _ | j t k s9 | j rH t | j | j d k r{ | j | j | j d | j } n | j | j d | j } yu y | j Wn t
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k s t t | _ | j r | j n | | _ | SWn | j Yn Xd S)a) 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
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.
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