MINI MINI MANI MO
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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 |qS )phrase).0vr r #/usr/lib64/python3.6/http/client.py
<dictcomp>k s r i i d s [^:\s][^:\r\n]*s \n(?![ \t])|\r(?![ \t\n])ZPATCHZPOSTZPUTdatac C sf y
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r` } z:t|j|j|j|jd|j | |j|j |f dW Y dd}~X nX dS )z<Call data.encode("latin-1") but show a better error message.zlatin-1z`%s (%.20r) is not valid Latin-1. Use %s.encode('utf-8') if you want to send it encoded in UTF-8.N)encodeUnicodeEncodeErrorencodingobjectstartendtitle)r nameerrr r r _encode s
r' c @ s e Zd Zdd ZdS ) HTTPMessagec C sn |j d }t|}g }d}xL| j D ]@}|d| j |krDd}n|dd j sXd}|r&|j| q&W |S )a 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.
:r N )lowerlenkeysisspaceappend)selfr% nZlstZhitliner r r getallmatchingheaders s
z!HTTPMessage.getallmatchingheadersN)__name__
__module__ __qualname__r3 r r r r r( s r( c C s| g }xR| j td }t|tkr(td|j| t|tkrJtdt |d krP qW dj|jd}t j
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aG 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.
r* z header linezgot more than %d headers
z
iso-8859-1)_class)r7 r8 r9 )
readline_MAXLINEr, r r/ _MAXHEADERSr joindecodeemailparserZParserZparsestr)fpr: headersr2 Zhstringr r r
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chunk_leftlength
will_close)r0 sockrG methodurlr r r __init__ s zHTTPResponse.__init__c C s t | jjtd d}t|tkr*td| jdkrBtdt| |sNt dy|j
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startswith _close_connr int)r0 r2 rK rL rM r r r _read_status s2
zHTTPResponse._read_statusc C s | j d k rd S xh| j \}}}|tkr(P xJ| jjtd }t|tkrNtd|j }|s\P | j dkr*t
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| _d S )Nr* z header liner zheader:HTTP/1.0HTTP/0.9
zHTTP/1. r) ztransfer-encodingrN TFzcontent-lengthr HEAD)ra rb ) rC r` ZCONTINUErB r; r< r, r striprG rY coderL rM rK r] r rD rI getr+ rN rO _check_closerQ rP r_ r\ Z
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zHTTPResponse.beginc C s | j jd}| jdkr:| j jd}|r6d|j kr6dS dS | j jdrJdS |r^d|j kr^dS | j jd}|r~d|j kr~dS dS )NZ
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keep-alivezproxy-connection)rC ri rK r+ )r0 ZconnZpconnr r r rj r s
zHTTPResponse._check_closec C s | j }d | _ |j d S )N)rB rn )r0 rB r r r r^ s zHTTPResponse._close_connc
s$ zt j W d | jr | j X d S )N)superrn rB r^ )r0 ) __class__r r rn s zHTTPResponse.closec s t j | jr| jj d S )N)ro flushrB )r0 )rp r r rq s
zHTTPResponse.flushc C s dS )zAlways returns TrueTr )r0 r r r readable s zHTTPResponse.readablec C s
| j dkS )z!True if the connection is closed.N)rB )r0 r r r isclosed s zHTTPResponse.isclosedc C s | j d krdS | jdkr$| j dS |d k rRt|}| j|}t|d | j S | jr`| j S | j d krv| j j
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zHTTPResponse.readc C s | j dkrdS | jdkr$| j dS | jr4| j|S | jdk r^t|| jkr^t|d| j }| j j|}| r~|r~| j n&| jdk r| j|8 _| js| j |S )z^Read up to len(b) bytes into bytearray b and return the number
of bytes read.
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r8 r9 )r r8 r9 )rB r; r< r, r )r0 r2 r r r _read_and_discard_trailer s z&HTTPResponse._read_and_discard_trailerc C sl | j }|sh|d k r | jd y | j }W n tk
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z HTTPResponse._get_chunk_leftc C sr | j tkstg }y8x,| j }|d kr(P |j| j| d| _qW dj|S tk
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)r0 valuerO r r r rx . s
z HTTPResponse._readall_chunkedc C s | j tkstd}t|}yvxp| j }|d kr2|S t||krZ| j|}|| | _|| S |d | }| j|}||d }||7 }d| _q W W n( tk
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rN rJ r rv r r, _safe_readintorO r
bytes)r0 r| total_bytesmvbrO r1 temp_mvbr r r r~ < s&
z HTTPResponse._readinto_chunkedc C sX g }xH|dkrL| j jt|t}|s4tdj|||j| |t|8 }qW dj|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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zHTTPResponse._safe_readc C s d}t |}xt|t|k rtt|k r@|dt }| jj|}n | jj|}|sjtt|d| t|||d }||7 }qW |S )z2Same as _safe_read, but for reading into a buffer.r N)rv r, r rB ru r
r )r0 r| r r r r1 r r r r k s zHTTPResponse._safe_readintor* c C s | j dks| jdkrdS | jr(| j|S | jdk rJ|dk sD|| jkrJ| j}y| j j|}W n* tk
r |dkrt | j jd}Y nX | r|r| j n | jdk r| jt|8 _|S )zvRead with at most one underlying system call. If at least one
byte is buffered, return that instead.
Nrf r9 r r i i @ ) rB rH rN _read1_chunkedrP read1r\ r^ r, )r0 r1 resultr r r r { s"
zHTTPResponse.read1c C s4 | j d ks| jdkrdS | jr(| j|S | j j|S )Nrf r9 )rB rH rN
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zHTTPResponse.peekc s | j d ks| jdkrdS | jr*t j|S | jd k rL|dk sF|| jkrL| j}| j j|}| rl|rl| j n | jd k r| jt|8 _|S )Nrf r9 r )rB rH rN ro r; rP r^ r, )r0 limitr )rp r r r; s
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)r0 r1 rO ry r r r r s zHTTPResponse._read1_chunkedc C sB y | j }W n tk
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| j j S )N)rB fileno)r0 r r r r s zHTTPResponse.filenoc C sH | j dkrt | j j|p |}t|ts6t|d r:|S dj|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.
N__iter__z, )rC r Zget_all
isinstancerX hasattrr> )r0 r% defaultrC r r r getheader s
zHTTPResponse.getheaderc C s | j dkrt t| j j S )z&Return list of (header, value) tuples.N)rC r listitems)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
the server at the head of the retrieved HTML page (including
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.
)rC )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
URL. The urlopen() function handles this transparently, but in
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.
)rT )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.
)rL )r0 r r r getcode
s zHTTPResponse.getcode)r NN)N)r r )r r )r )N)"r4 r5 r6 rU r` rm rj r^ rn rq rr rs ry ru r r r rx r~ rz r r r r; r r r r r r r r r
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rL Y nX t| tr`t| S dS )a Get the content-length based on the body.
If the body is None, we set Content-Length: 0 for methods that expect
a body (RFC 7230, Section 3.3.2). We also set the Content-Length for
any method if the body is a str or bytes-like object and not a file.
Nr ry ) upper_METHODS_EXPECTING_BODYr rv nbytes TypeErrorr rX r, )bodyrS Zmvr r r _get_content_length$ s
z"HTTPConnection._get_content_lengthNc C s\ || _ || _d | _g | _d | _t| _d | _d | _d | _ i | _
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tj| _d S )N)timeoutsource_addressrR _buffer_HTTPConnection__response_CS_IDLE_HTTPConnection__staterH _tunnel_host _tunnel_port_tunnel_headers
_get_hostporthostportsocketZcreate_connection_create_connection)r0 r r r r r r r rU D s zHTTPConnection.__init__c C s< | j rtd| j||\| _| _|r.|| _n
| jj dS )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 rC r r r
set_tunnelW s zHTTPConnection.set_tunnelc C s |d kr|j d}|j d}||kryt||d d }W nH tk
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Nr) ]r* rW znonnumeric port: '%s'r [r r )rfindr_ r\ default_portr )r0 r r r jr r r r o s
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|| _ d S )N)rG )r0 levelr r r set_debuglevel s z HTTPConnection.set_debuglevelc C s d| j | jf }|jd}| j| x6| jj D ](\}}d||f }|jd}| j| q0W | jd | j| j| jd}|j \}} }
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zHTTPConnection._tunnelc C sB | j | j| jf| j| j| _| jjtjtj d | j
r>| j dS )z3Connect to the host and port specified in __init__.r* N) r r r r r rR Z
setsockoptr Z IPPROTO_TCPZ TCP_NODELAYr r )r0 r r r connect s
zHTTPConnection.connectc C sB t | _z | j}|r d| _|j W d| j}|r<d| _|j X dS )z(Close the connection to the HTTP server.N)r r rR rn r )r0 rR r r r r rn s zHTTPConnection.closec C s | j dkr | jr| j nt | jdkr8tdt| d}t|dr| jdkrXtd | j|}|rx| jdkrxtd x.|j |}|sP |r|j
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zSend `data' to the server.
``data`` can be a string object, a bytes object, an array object, a
file-like object that supports a .read() method, or an iterable object.
Nr zsend:i ry zsendIng a read()ablez encoding file using iso-8859-1z
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zHTTPConnection.sendc C s | j j| dS )zuAdd a line of output to the current request buffer.
Assumes that the line does *not* end with \r\n.
N)r r/ )r0 r} r r r _output s zHTTPConnection._outputc c sd d}| j dkrtd | j|}|r6| j dkr6td x(|j|}|sHP |rV|jd}|V q8W d S )Ni r zsendIng a read()ablez encoding file using iso-8859-1z
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z HTTPConnection._read_readableFc C s$ | j jd
dj| j }| j dd= | j| |dk r t|drN| j|}nZy t| W nF tk
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jd | d }| j| qW |r | j dkr | jd dS )zSend the currently buffered request and clear the buffer.
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f |s| jdd n dS )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
N/z%s %s %sr rd rW r ZidnaZHostr) r [ ]z%s:%szAccept-EncodingZidentity)r rs r r _CS_REQ_STARTEDr
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zHTTPConnection.putrequestc G s | j tkrt t|dr$|jd}t|s:td|f t|}xht|D ]\\}}t|drn|jd||< n t |t
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|}|d | }| j| dS ) 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_valuer> r )r0 r valuesr Z one_valuer r r r r s"
zHTTPConnection.putheader)r c C s* | j tkrt| _ nt | j||d dS )zIndicate 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.
)r N)r r _CS_REQ_SENTr r )r0 r r r r r
endheaders s
zHTTPConnection.endheadersc C s | j ||||| dS )z&Send a complete request to the server.N)
_send_request)r0 rS rT r rC r r r r r s zHTTPConnection.requestc C s t dd |D }i }d|kr&d|d< d|kr6d|d< | j||f| d|krd |krd
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z HTTPConnection._send_requestc C s | j r| j j rd| _ | jtks&| j r0t| j| jdkrR| j| j| j| jd}n| j| j| jd}yZy |j W n t
k
r | j Y nX |j t
kstt| _|j r| j n|| _ |S |j Y nX dS )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
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