CURLMOPT_PIPELINING(3)     curl_multi_setopt options    CURLMOPT_PIPELINING(3)

NAME
       CURLMOPT_PIPELINING - enable HTTP pipelining and multiplexing

SYNOPSIS
       #include <curl/curl.h>

       CURLMcode  curl_multi_setopt(CURLM  *handle,  CURLMOPT_PIPELINING, long
       bitmask);

DESCRIPTION
       Pass in the bitmask  parameter  to  instruct  libcurl  to  enable  HTTP
       pipelining and/or HTTP/2 multiplexing for this multi handle.

       When  enabled, libcurl will attempt to use those protocol features when
       doing parallel requests to the same hosts.

       For pipelining, 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.

       For multiplexing, this means that  follow-up  requests  can  re-use  an
       existing  connection  and send the new request multiplexed over that at
       the same time as other transfers are already using that single  connec-
       tion.

       There  are  several other related options that are interesting to tweak
       and adjust to alter how libcurl spreads out requests on different  con-
       nections or not etc.

       Before  7.43.0,  this  option  was set to 1 and 0 to enable and disable
       HTTP/1.1 pipelining.

       Starting in 7.43.0, bitmask's second bit also has a  meaning,  and  you
       can  ask for pipelining and multiplexing independently of each other by
       toggling the correct bits.

       CURLPIPE_NOTHING
       Default, which means doing no attempts at pipelining or multiplexing.

       CURLPIPE_HTTP1
        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.

       CURLPIPE_MULTIPLEX
         If  this  bit  is set, libcurl will try to multiplex the new transfer
         over an existing connection if possible. This requires HTTP/2.

DEFAULT
       0 (both pipeline and multiplexing are off)

PROTOCOLS
       HTTP(S)

EXAMPLE
       TODO

AVAILABILITY
       Added in 7.16.0. Multiplex support bit added in 7.43.0.

RETURN VALUE
       Returns CURLM_OK if the option is supported,  and  CURLM_UNKNOWN_OPTION
       if not.

SEE ALSO
       CURLMOPT_MAX_PIPELINE_LENGTH(3),  CURLMOPT_PIPELINING_SITE_BL(3), CURL-
       MOPT_CONTENT_LENGTH_PENALTY_SIZE(3),                              CURL-
       MOPT_CHUNK_LENGTH_PENALTY_SIZE(3),    CURLMOPT_MAX_HOST_CONNECTIONS(3),
       CURLMOPT_MAXCONNECTS(3), CURLMOPT_MAX_HOST_CONNECTIONS(3),

libcurl 7.54.0                September 01, 2016        CURLMOPT_PIPELINING(3)