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.\" generated by cd2nroff 0.1 from CURLMOPT_PIPELINING.md
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.TH CURLMOPT_PIPELINING 3 "2024-09-25" libcurl
.SH NAME
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CURLMOPT_PIPELINING \- enable HTTP multiplexing
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_PIPELINING, long bitmask);
.fi
.SH DESCRIPTION
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Pass in the correct value in the \fBbitmask\fP parameter to instruct libcurl to
enable multiplexing for this multi handle.
With multiplexing enabled, libcurl attempts to do multiple transfers over the
same connection when doing parallel transfers to the same hosts.
.IP "CURLPIPE_NOTHING (0)"
Default, which means doing no attempts at multiplexing.
.IP "CURLPIPE_HTTP1 (1)"
This bit is deprecated and has no effect since version 7.62.0.
.IP "CURLPIPE_MULTIPLEX (2)"
If this bit is set, libcurl tries to multiplex the new transfer over an
existing connection if possible. This requires HTTP/2 or HTTP/3.
.SH DEFAULT
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\fBCURLPIPE_MULTIPLEX\fP
.SH PROTOCOLS
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This functionality affects http only
.SH EXAMPLE
.nf
int main(void)
{
CURLM *m = curl_multi_init();
/* try HTTP/2 multiplexing */
curl_multi_setopt(m, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
}
.fi
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.SH HISTORY
The multiplex support bit was added in 7.43.0. HTTP/1 Pipelining support was
disabled in 7.62.0.
Since 7.62.0, \fBCURLPIPE_MULTIPLEX\fP is enabled by default.
Before that, default was \fBCURLPIPE_NOTHING\fP.
.SH AVAILABILITY
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Added in curl 7.16.0
.SH RETURN VALUE
Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
.SH SEE ALSO
.BR CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE (3),
.BR CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE (3),
.BR CURLMOPT_MAXCONNECTS (3),
.BR CURLMOPT_MAX_HOST_CONNECTIONS (3),
.BR CURLMOPT_MAX_PIPELINE_LENGTH (3),
.BR CURLMOPT_PIPELINING_SITE_BL (3)