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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>
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returned, without interpretation. If the header does not occur, an
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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.
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z HTTPResponse._readall_chunkedc C s� | j tkst�d}t|�}yvxp| �� }|d kr2|S t|�|krZ| �|�}|| | _|| S |d |� }| �|�}||d � }||7 }d| _q W W n( tk
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z HTTPResponse._readinto_chunkedc C sX g }xH|dkrL| j �t|t��}|s4td�|�|��|�|� |t|�8 }qW d�|�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.
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.
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r� )r0 rz r� r� r� r1 r r r r� { s zHTTPResponse._safe_readinto���c C s� | j dks| jdkrdS | jr(| �|�S | jdk rJ|dk sD|| jkrJ| j}| j �|�}|sh|rh| �� n | jdk r�| jt|�8 _|S )zvRead with at most one underlying system call. If at least one
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zHTTPResponse.readlinec C sd | � � }|d ks|dkr dS d| kr0|ks6n |}| j�|�}| jt|�8 _|s`td��|S )Nr r8 )r� r< r� rN r, r
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| j �� S )N)r< �fileno)r0 r r r r� � s zHTTPResponse.filenoc C sF | j dkrt� �| j �|�p |}t|t�s4t|d�s8|S d�|�S dS )ax Returns the value of the header matching *name*.
If there are multiple matching headers, the values are
combined into a single string separated by commas and spaces.
If no matching header is found, returns *default* or None if
the *default* is not specified.
If the headers are unknown, raises http.client.ResponseNotReady.
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zHTTPResponse.getheaderc C s | j dkrt� �t| j �� �S )z&Return list of (header, value) tuples.N)r= r �listrf )r0 r r r �
getheaders� s
zHTTPResponse.getheadersc C s | S )Nr )r0 r r r r� � s zHTTPResponse.__iter__c C s | j S )aj Returns an instance of the class mimetools.Message containing
meta-information associated with the URL.
When the method is HTTP, these headers are those returned by
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Content-Length and Content-Type).
When the method is FTP, a Content-Length header will be
present if (as is now usual) the server passed back a file
length in response to the FTP retrieval request. A
Content-Type header will be present if the MIME type can be
guessed.
When the method is local-file, returned headers will include
a Date representing the file's last-modified time, a
Content-Length giving file size, and a Content-Type
containing a guess at the file's type. See also the
description of the mimetools module.
)r= )r0 r r r �info� s zHTTPResponse.infoc C s | j S )aZ Return the real URL of the page.
In some cases, the HTTP server redirects a client to another
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some cases the caller needs to know which URL the client was
redirected to. The geturl() method can be used to get at this
redirected URL.
)rS )r0 r r r �geturl
s
zHTTPResponse.geturlc C s | j S )zuReturn the HTTP status code that was sent with the response,
or None if the URL is not an HTTP URL.
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� tj| _d S )N)�timeout�source_address� blocksizerQ �_buffer�_HTTPConnection__response�_CS_IDLE�_HTTPConnection__staterG � _tunnel_host� _tunnel_port�_tunnel_headers�
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| j�� dS )aD Set up host and port for HTTP CONNECT tunnelling.
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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.
This method must be called before the HTML connection has been
established.
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with the CONNECT request.
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dt|� ��Y nX dS ) z�Send `data' to the server.
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z HTTPConnection._read_readableFc C s$ | j �d� d�| j �}| j dd�= | �|� |dk �r t|d�rN| �|�}nZy t|� W nF tk
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)r8 r8 s
Nrw zAmessage_body should be a bytes-like object or an iterable, got %rr zZero length chunk ignoredra �Xz
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