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  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
       Default, which means doing no attempts at multiplexing.

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

       CURLPIPE_MULTIPLEX
         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

       Since 7.62.0, CURLPIPE_MULTIPLEX is enabled by default.

       Before that, default was CURLPIPE_NOTHING.

PROTOCOLS

       HTTP(S)

EXAMPLE

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

AVAILABILITY

       Added in 7.16.0. Multiplex support bit added in  7.43.0.  HTTP/1  Pipelining  support  was
       disabled in 7.62.0.

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_MAX_HOST_CONNECTIONS(3),                         CURLMOPT_MAX_PIPELINE_LENGTH(3),
       CURLMOPT_MAXCONNECTS(3), CURLMOPT_PIPELINING_SITE_BL(3)