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)