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90 lines
3.7 KiB
Groff
90 lines
3.7 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLMOPT_PIPELINING 3 "17 Jun 2014" "libcurl 7.37.0" "curl_multi_setopt options"
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.SH NAME
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CURLMOPT_PIPELINING \- enable HTTP pipelining and multiplexing
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_PIPELINING, long bitmask);
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.SH DESCRIPTION
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Pass in the \fBbitmask\fP parameter to instruct libcurl to enable HTTP
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pipelining and/or HTTP/2 multiplexing for this multi handle.
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When enabled, libcurl will attempt to use those protocol features when doing
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parallel requests to the same hosts.
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For pipelining, this means that if you add a second request that can use an
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already existing connection, the second request will be \&"piped" on the same
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connection rather than being executed in parallel.
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For multiplexing, this means that follow-up requests can re-use an existing
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connection and send the new request multiplexed over that at the same time as
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other transfers are already using that single connection.
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There are several other related options that are interesting to tweak and
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adjust to alter how libcurl spreads out requests on different connections or
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not etc.
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Before 7.43.0, this option was set to 1 and 0 to enable and disable HTTP/1.1
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pipelining.
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Starting in 7.43.0, \fBbitmask\fP's second bit also has a meaning, and you can
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ask for pipelining and multiplexing independently of each other by toggling
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the correct bits.
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.IP CURLPIPE_NOTHING (0)
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Default, which means doing no attempts at pipelining or multiplexing.
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.IP CURLPIPE_HTTP1 (1)
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If this bit is set, libcurl will try to pipeline HTTP/1.1 requests on
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connections that are already established and in use to hosts.
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This bit is deprecated and has no effect since version 7.62.0.
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.IP CURLPIPE_MULTIPLEX (2)
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If this bit is set, libcurl will try to multiplex the new transfer over an
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existing connection if possible. This requires HTTP/2.
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.SH DEFAULT
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Since 7.62.0, \fBCURLPIPE_MULTIPLEX\fP is enabled by default.
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Before that, default was \fBCURLPIPE_NOTHING\fP.
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.SH PROTOCOLS
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HTTP(S)
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.SH EXAMPLE
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.nf
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CURLM *m = curl_multi_init();
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/* try HTTP/2 multiplexing */
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curl_multi_setopt(m, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
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.fi
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.SH AVAILABILITY
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Added in 7.16.0. Multiplex support bit added in 7.43.0. HTTP/1 Pipelining
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support was disabled in 7.62.0.
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.SH RETURN VALUE
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Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLMOPT_MAX_PIPELINE_LENGTH "(3), "
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.BR CURLMOPT_PIPELINING_SITE_BL "(3), "
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.BR CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE "(3), "
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.BR CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE "(3), "
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.BR CURLMOPT_MAX_HOST_CONNECTIONS "(3), "
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.BR CURLMOPT_MAXCONNECTS "(3), "
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.BR CURLMOPT_MAX_HOST_CONNECTIONS "(3), "
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