NAME

       CURLMOPT_PIPELINING - enable HTTP multiplexing

SYNOPSIS

       #include <curl/curl.h>

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

DESCRIPTION

       Pass  in  the  correct  value  in  the  bitmask  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.

       CURLPIPE_NOTHING (0)
              Default, which means doing no attempts at multiplexing.

       CURLPIPE_HTTP1 (1)
              This bit is deprecated and has no effect since version 7.62.0.

       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.

DEFAULT

       CURLPIPE_MULTIPLEX

PROTOCOLS

       This functionality affects http only

EXAMPLE

       int main(void)
       {
         CURLM *m = curl_multi_init();
         /* try HTTP/2 multiplexing */
         curl_multi_setopt(m, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
       }

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, CURLPIPE_MULTIPLEX is enabled by default.

       Before that, default was CURLPIPE_NOTHING.

AVAILABILITY

       Added in curl 7.16.0

RETURN VALUE

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

SEE ALSO

       CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE(3),            CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE(3),
       CURLMOPT_MAXCONNECTS(3),                                 CURLMOPT_MAX_HOST_CONNECTIONS(3),
       CURLMOPT_MAX_PIPELINE_LENGTH(3), CURLMOPT_PIPELINING_SITE_BL(3)