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.\" **************************************************************************
.\" * _ _ ____ _
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.\" * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" *
.\" * This software is licensed as described in the file COPYING, which
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.\" * are also available at https://curl.haxx.se/docs/copyright.html.
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.\" * copies of the Software, and permit persons to whom the Software is
.\" * furnished to do so, under the terms of the COPYING file.
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.\" * KIND, either express or implied.
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.\" **************************************************************************
.\"
.TH CURLMOPT_PIPELINING 3 "17 Jun 2014" "libcurl 7.37.0" "curl_multi_setopt options"
.SH NAME
CURLMOPT_PIPELINING \- enable/disable HTTP pipelining
.SH SYNOPSIS
#include <curl/curl.h>
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_PIPELINING, long bits);
.SH DESCRIPTION
Set the \fBbits\fP parameter to 1 to make libcurl use HTTP pipelining for
HTTP/1.1 transfers done using this multi handle, as far as possible. This
means that if you add a second request that can use an already existing
connection, the second request will be \&"piped" on the same connection rather
than being executed in parallel.
When using pipelining, there are also several other related options that are
interesting to tweak and adjust to alter how libcurl spreads out requests on
different connections or not etc.
Starting in 7.43.0, the \fBbits\fP parameter's bit 1 also has a meaning and
libcurl is now offering symbol names for the bits:
.IP CURLPIPE_NOTHING (0)
Default, which means doing no attempts at pipelining or multiplexing.
.IP CURLPIPE_HTTP1 (1)
If this bit is set, libcurl will try to pipeline HTTP/1.1 requests on
connections that are already established and in use to hosts.
.IP CURLPIPE_MULTIPLEX (2)
If this bit is set, libcurl will try to multiplex the new transfer over an
existing connection if possible. This requires HTTP/2.
.SH DEFAULT
0 (off)
.SH PROTOCOLS
HTTP(S)
.SH EXAMPLE
TODO
.SH AVAILABILITY
Added in 7.16.0. Multiplex support bit added in 7.43.0.
.SH RETURN VALUE
Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLMOPT_MAX_PIPELINE_LENGTH "(3), "
.BR CURLMOPT_PIPELINING_SITE_BL "(3), "
.BR CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE "(3), "
.BR CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE "(3), "
.BR CURLMOPT_MAX_HOST_CONNECTIONS "(3), "
.BR CURLMOPT_MAXCONNECTS "(3), "
.BR CURLMOPT_MAX_HOST_CONNECTIONS "(3), "
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