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HTTP/1.1 client library
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
Req-started-unread-response _CS_REQ_STARTED
Req-sent-unread-response _CS_REQ_SENT
N)urlsplit) HTTPResponseHTTPConnection
HTTPException NotConnectedUnknownProtocolUnknownTransferEncodingUnimplementedFileModeIncompleteRead
InvalidURLImproperConnectionStateCannotSendRequestCannotSendHeaderResponseNotReady
BadStatusLine LineTooLongRemoteDisconnectederror responsesP i UNKNOWNIdlezRequest-startedz Request-senti d i s [^:\s][^:\r\n]*s \n(?![ \t])|\r(?![ \t\n])z[ - ]z[ - ]> PUTPOSTPATCHc
U R S5 $ ! [ an n[ UR UR UR UR
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{{8a<( t9x m, ,t w<+ % :[ HI I ( ( N r6 c SR U 5 R S5 n[ R R US9R U5 $ )a/
Parses only RFC 5322 headers from header lines.
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.
r6
iso-8859-1)_class)joindecodeemailparserParserparsestr) header_linesr[ hstrings r) _parse_header_linesrd s@ hh|$++L9G << f - 6 6w ??r6 c . [ U 5 n[ X!5 $ )z1Parses only RFC 5322 headers from a file pointer.)rX rd )rV r[ rW s r)
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will_close)rB sockrk methodurls r) __init__HTTPResponse.__init__
sa --%$ #'& tx " "r6 c [ U R R [ S- 5 S5 n[ U5 [ : a [ S5 eU R S: a [ S[ U5 5 U( d [ S5 e UR S S5 u p#nUR S 5 ( d U R 5 [ U5 e [ W5 nUS
: d US : a [ U5 e X#W4$ ! [ a- UR S S5 u p#Sn N|! [ a Sn Nf = ff = f! [ a [ U5 ef = f) Nr< rZ z status liner zreply:z-Remote end closed connection without response zHTTP/r i )strrV rS rT r> r rk printreprr split
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S U l Nf = f)NTr zheaders:)zHTTP/1.0zHTTP/0.9
zHTTP/1. header:r; transfer-encodingrr Fcontent-lengthr HEAD) rW r CONTINUErX rV rk r coderp striprq ro r2 r rf rm itemsgetr= rr rs _check_closeru rt r r
NO_CONTENT NOT_MODIFIEDrl ) rB ro rp rq skipped_headershdrvaltr_encrt s r) beginHTTPResponse.beginI s << # &*&7&7&9 #GV! +DGG 4O"j/2 #)( DK lln . . DL
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connectionr closeTFz
keep-alivezproxy-connection)rW r ro r= )rB connpconns r) r HTTPResponse._check_close s || - <<2 4::</ << L ) ) LDJJL0 !34 \U[[]2 r6 c J U R nS U l UR 5 g N)rV r )rB rV s r) r HTTPResponse._close_conn s
WW
r6 c > [ TU ] 5 U R ( a U R 5 g g ! U R ( a U R 5 f f = fr )superr rV r rB __class__s r) r HTTPResponse.close sB # GMOww " tww " s 4 $Ac z > [ TU ] 5 U R ( a U R R 5 g g r )r flushrV r s r) r HTTPResponse.flush s%
77 GGMMO r6 c g)zAlways returns TrueTrI rB s r) readableHTTPResponse.readable s r6 c U R SL $ )z!True if the connection is closed.N)rV r s r) isclosedHTTPResponse.isclosed s ww$ r6 c U R c gU R S:X a U R 5 gU R ( a U R U5 $ Ub US: a U R
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( d U R 5 U$ )zNRead up to len(b) bytes into bytearray b and return the number
of bytes read.
r r ) rV rl r rr _readinto_chunkedrt r>
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77? <<6 ! <<))!, , ;; "1v # qM!DKK0
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chunk size ;r ) rV rS rT r> r findr r r )rB rF is r) _read_next_chunk_size"HTTPResponse._read_next_chunk_size s ww 1 - t9x l+ + IIdO 68D tR=
s A* * Bc U R R [ S- 5 n[ U5 [ : a [ S5 eU( d g US; a g MQ )Nr< z trailer linerP )rV rS rT r> r rB rF s r) _read_and_discard_trailer&HTTPResponse._read_and_discard_trailer. sO 77##HqL1D4y8#!.11 ,, r6 c U R nU( dS Ub U R S5 U R 5 nUS:X a" U R 5 U R
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nSU l Mi ! [ a [ [ USU 5 5 ef = f)Nr ) rr rn r r r> _safe_readintors r bytes)rB r total_bytesmvbrs rC temp_mvbs r) r HTTPResponse._readinto_chunkedh s ||x''' m : ! 1 1 3
%&&s8z) ++C0A&0nDO&?* {
+''1"g "# : q;'7!89 9 :s B ,B ('B "B1c X [ U[ 5 nU R R U5 n[ U5 U: a U$ [ U5 U: a [ X1[ U5 -
5 e[ R " U5 nUR SS5 [ X!U-
5 nUR U R R U5 5 UR 5 U: a UR 5 $ X$-
nUR 5 U: a* [ UR 5 XR 5 -
5 eM )zRead the number of bytes requested.
This function should be used when bytes "should" be present for
reading. If the bytes are truly not available (due to EOF), then the
IncompleteRead exception can be used to detect the problem.
r r| ) min_MIN_READ_BUF_SIZErV r r> r ioBytesIOseekwritetellgetvalue)rB r cursizer& deltas r) r HTTPResponse._safe_read s c-.ww||G$ t9 K t9w SY7 7zz$ !Q w /E JJtww||E* +yy{c!}}& Gyy{W$$T]]_cIIK6GHH r6 c [ U5 nU R R U5 nX2: a [ [ USU 5 X#-
5 eU$ )z2Same as _safe_read, but for reading into a buffer.N)r> rV r r r )rB r r rC s r) r HTTPResponse._safe_readinto sB !f GG Q 7 q!u su5 5r6 c U R b U R S:X a gU R ( a U R U5 $ U R b! US: d XR : a U R nU R R U5 nU( d U( a U R
5 U$ U R b? U =R [ U5 - sl U R ( d U R
5 U$ )zfRead with at most one underlying system call. If at least one
byte is buffered, return that instead.
r r6 r )rV rl rr _read1_chunkedrt read1r r> )rB rC results r) r HTTPResponse.read1 s 77?dllf 4 <<&&q) ) ;; "A[[ A q!!
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aQ$*$Aww}}Q 3t9$ % % r6 c U R 5 nUc gU R R U5 S U $ ! [ a gf = f)Nr6 )r r rV r )rB rC rs s r) r HTTPResponse._peek_chunked sP --/J ww||J' 44
s 4
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[ 5 eU R R U5 =( d Un[ U[ 5 ( d [ US5 ( d U$ SR
U5 $ )aH 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.
__iter__z, )rW r get_all
isinstancer~ hasattrr\ )rB r' defaultrW s r) getheaderHTTPResponse.getheader s] << "$ $,,&&t,7 gs # #77J+G+GN99W% %r6 c v U R c
[ 5 e[ U R R 5 5 $ )z&Return list of (header, value) tuples.)rW r listr r s r)
getheadersHTTPResponse.getheaders s- << "$ $DLL&&())r6 c U $ r rI r s r) r HTTPResponse.__iter__
s r6 c U R $ )a 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.
)rW r s r) infoHTTPResponse.info s * ||r6 c U R $ )a* 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.
)rx r s r) geturlHTTPResponse.geturl& s
xxr6 c U R $ )zeReturn the HTTP status code that was sent with the response,
or None if the URL is not an HTTP URL.
)rp r s r) getcodeHTTPResponse.getcode2 s
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rl rs rr r rk rV rW rt rm rq rp ro ru )r NNr ))$rJ rK rL rM ry r r r r r r r r r r r r r r r r r r r rS r r r r r r r r r rN
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r6 r c [ R " 5 nU S:X a UR S/5 UR b SUl U$ )Nr zhttp/1.1T)ssl _create_default_https_contextset_alpn_protocolspost_handshake_auth) http_versioncontexts r) _create_https_contextr : sC //1Gr""J<0"".&*# Nr6 c " \ rS rSrSrSr\r\r Sr
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U [ 5 ( a [ U 5 $ g)zGet the content-length based on the body.
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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 r ) upper_METHODS_EXPECTING_BODYr r nbytes TypeErrorr r~ r> )bodyrw mvs r) _get_content_length"HTTPConnection._get_content_lengthW sw < ||~!88 4 D!B99 dC t9 s A
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0 U l S U l U R X5 u U l U l U R! U R 5 [" R$ U l g r )timeoutsource_address blocksizerv _buffer_HTTPConnection__response_CS_IDLE_HTTPConnection__staterl _tunnel_host _tunnel_port_tunnel_headers_raw_proxy_headers
_get_hostporthostport_validate_hostsocketcreate_connection_create_connection)rB r< r= r0 r1 r2 s r) ry HTTPConnection.__init__w s ," ! "& !%!3!3D!? DI DII& #)":": r6 c U R ( a [ S5 eU R X5 u U l U l U( a UR 5 U l OU R R 5 [ S U R 5 5 ( dH U R R S5 R S5 nSX@R 4- U R S' gg)ay Set up host and port for HTTP CONNECT tunnelling.
In a connection that uses HTTP CONNECT tunnelling, 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 HTTP connection has been
established.
The headers argument should be a mapping of extra HTTP headers to send
with the CONNECT request.
As HTTP/1.1 is used for HTTP CONNECT tunnelling request, as per the RFC
(https://tools.ietf.org/html/rfc7231#section-4.3.6), a HTTP Host:
header must be provided, matching the authority-form of the request
target provided as the destination for the CONNECT request. If a
HTTP Host: header is not provided via the headers argument, one
is generated and transmitted automatically.
z.Can't set up tunnel for established connectionc 3 F # U H oR 5 S :H v M g7f)r< Nr= ).0headers r) ,HTTPConnection.set_tunnel.. s O:N<<>V+:Ns !idnaasciiz%s:%dHostN) rv RuntimeErrorr; r7 r8 copyr9 clearanyr r] )rB r< r= rW encoded_hosts r)
set_tunnelHTTPConnection.set_tunnel s , 99 OP P/3/A/A$/M,4, #*<<>D & & (O$:N:NOOO ,,33F;BB7KL+2 / /61 ,1D ( Pr6 c R UcJ UR S5 nUR S5 nX4: a [ XS- S 5 nUS U nO U R nU( a US S:X a US S:X a USS nX4$ ! [ a- XS- S S:X a U R n NV[ SXS- S - 5 ef = f) Nr; ]r< r} znonnumeric port: '%s'r [r )rfindr r default_portr )rB r< r= r js r) r; HTTPConnection._get_hostport s <
3A
3AuO taCDz?D BQx(( DGsNtBx3":D| " OaCDzR' # 0 0 ()@4!:)M NN Os A/ /!B&B&c Xl g r )rk )rB levels r) set_debuglevel HTTPConnection.set_debuglevel s r6 c 4 SU; a US S:w a SU- S- $ U$ )N :r [ r/ r0 rI )rB ips r)
_wrap_ipv6HTTPConnection._wrap_ipv6 s( 2:"Q%7*"9t# # r6 c [ R U R 5 ( a [ SU R < 35 eSU R U R R S5 5 U R U R R S5 4- nU/nU R R 5 Hz u p4UR S5 nUR S5 n[ U5 ( d [ SU< 35 e[ U5 ( a [ SU< 35 eUR SXV4- 5 M| UR S 5 U R S
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rJ rK r Invalid header name Invalid header value s %s: %s
rQ r6 rw r r zTunnel connection failed: ) !_contains_disallowed_url_pchar_researchr7 r rc r r8
_http_vsn_strr9 r _is_legal_header_name_is_illegal_header_valuerA sendr\ response_classrv rl r rX rV r: rk r r] http
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5) OOD - - 4 4V < = % %g .-0 0 ) ! 1 1 7 7 9MF!==3L ,,y1K( 66 \!KLL' 44 k!KLL NN=L+FF G : w
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received from the proxy server to the CONNECT request
sent to set the tunnel.
If the CONNECT request was not sent, the method returns None.
N)r: rd r s r) get_proxy_response_headers)HTTPConnection.get_proxy_response_headers s/ &&2
7 7 8
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setsockoptr? IPPROTO_TCP TCP_NODELAYrt errno ENOPROTOOPTr7 rz rB es r) ru HTTPConnection.connect s 'yy$))D++
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C? C::C?c & [ U l U R nU( a SU l UR 5 U R nU( a SU l UR 5 gg! U R nU( a SU l UR 5 f f = f)z(Close the connection to the HTTP server.N)r5 r6 rv r r4 )rB rv rx s r) r HTTPConnection.close sr !99D
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zSend `data' to the server.
``data`` can be a string object, a bytes object, an array object, a
file-like object that supports a .read() method, or an iterable object.
Nr zsend:r zsending a readable encoding file using iso-8859-1rZ zhttp.client.sendz9data should be a bytes-like object or an iterable, got %r)rv auto_openru r rk r r r r# r r2 r r r sendallr) r collectionsabcIterabletype)rB r& r datablockds r) ro HTTPConnection.send" s 99 ~~ "n$ ??Q '4: & 4 "*+__T*F$//A-67 #yy 88)8 ) 0 0 >I ,d> !!), $yy 88)8
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