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<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>
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HTTPExceptiont NotConnectedt UnknownProtocolt UnknownTransferEncodingt UnimplementedFileModet IncompleteReadt
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No Contents
Reset Contents Partial Contents Multiple Choicess Moved Permanentlyt Founds See Others Not Modifieds Use Proxys (Unused)i2 s Temporary Redirects Bad Requestt Unauthorizeds Payment Requiredt Forbiddens Not Founds Method Not Alloweds Not Acceptables Proxy Authentication Requireds Request Timeoutt Conflictt Gones Length Requireds Precondition Faileds Request Entity Too Larges Request-URI Too Longs Unsupported Media Types Requested Range Not Satisfiables Expectation Faileds Internal Server Errors Not Implementeds Bad Gateways Service Unavailables Gateway Timeouts HTTP Version Not Supportedi i s \A[^:\s][^:\r\n]*\Zs \n(?![ \t])|\r(?![ \t\n])s [ - -�]t PATCHt POSTt PUTt HTTPMessagec B s# e Z d � Z d � Z d � Z RS( c C sT | j j | � } | d k r. | | j | <n" d j | | f � } | | j | <d S( s* Add header for field key handling repeats.s , N( t dictt gett Nonet join( t selft keyt valuet prevt combined( ( s, /opt/alt/python27/lib64/python2.7/httplib.pyt addheader s
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| _ qh Wd S( s Read header lines.
Read header lines up to the entirely blank line that terminates them.
The (normally blank) line that ends the headers is skipped, but not
included in the returned list. If an invalid line is found in the
header section, it is skipped, and further lines are processed.
The variable self.status is set to the empty string if all went well,
otherwise it is an error message. The variable self.headers is a
completely uninterpreted list of lines contained in the header (so
printing them will reproduce the header exactly as it appears in the
file).
If multiple header fields with the same name occur, they are combined
according to the rules in RFC 2616 sec 4.2:
Appending each subsequent field-value to the first, each separated
by a comma. The order in which header fields with the same field-name
are received is significant to the interpretation of the combined
field value.
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c C s g } xi | d k rq | j j t | t � � } | sQ t d j | � | � � n | j | � | t | � 8} q Wd j | � S( sV 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
IncompleteRead exception can be used to detect the problem.
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| j j � d S( sC 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 proxy server that relays all communication to the
endpoint passed to set_tunnel. This is done by sending a HTTP CONNECT
request to the proxy server when the connection is established.
This method must be called before the HTTP connection has been
established.
The headers argument should be a mapping of extra HTTP headers
to send with the CONNECT request.
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c C sD | j | j | j f | j | j � | _ | j r@ | j � n d S( s3 Connect to the host and port specified in __init__.N( R� R� R� R� R� R[ R� R� ( R) ( ( s, /opt/alt/python27/lib64/python2.7/httplib.pyt connect> s c C s_ t | _ z) | j } | r1 d | _ | j � n Wd | j } | rZ d | _ | j � n Xd S( s( Close the connection to the HTTP server.N( R� R� R[ R' Rb R� ( R) R[ R� ( ( s, /opt/alt/python27/lib64/python2.7/httplib.pyRb F s c C s� | j d k r1 | j r% | j � q1 t � � n | j d k rR d Gt | � GHn d } t | d � r� t | t � r� | j d k r� d GHn | j
| � } x< | r� | j j | � | j
| � } q� Wn | j j | � d S( s Send `data' to the server.i s send:i Rw s sendIng a read()ableN( R[ R' t auto_openR� R RP R_ R6 t
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c C s | j j | � d S( su Add a line of output to the current request buffer.
Assumes that the line does *not* end with \r\n.
N( R� RB ( R) Rz ( ( s, /opt/alt/python27/lib64/python2.7/httplib.pyt _outputh s c C sx | j j d � d j | j � } | j 2t | t � rK | | 7} d } n | j | � | d k rt | j | � n d S( s� 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.
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f � n | s| j d d � qn d S( s` 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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c C sF t j | � } | rB d j d | j � d | � } t | � � n d S( s9 Validate a host so it doesn't contain control characters.sK URL can't contain control characters. {host!r} (found at least {matched!r})R� R� N( R� R� R� R� R ( R) R� R� RS ( ( s, /opt/alt/python27/lib64/python2.7/httplib.pyR�
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c G s� | j t k r t � � n d | } t | � sG t d | f � � n g | D] } t | � ^ qN } x0 | D]( } t | � rm t d | f � � qm qm Wd | d j | � f } | j | � d S( sk Send a request header line to the server.
For example: h.putheader('Accept', 'text/html')
s %ss Invalid header name %rs Invalid header value %rs %s: %ss
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c C s5 | j t k r t | _ n t � � | j | � d S( s� 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 string, otherwise it is
sent as a separate packet.
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