CURLOPT_PIPEWAIT(3) Library Functions Manual CURLOPT_PIPEWAIT(3)
NAME
CURLOPT_PIPEWAIT - wait for multiplexing
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PIPEWAIT, long wait);
DESCRIPTION
Set wait to 1L to tell libcurl to prefer to wait for a connection to
confirm or deny that it can do multiplexing before continuing.
When about to perform a new transfer that allows multiplexing, libcurl
checks for existing connections to use. If no such connection exists it
immediately continues and creates a fresh new connection to use.
By setting this option to 1 - and having CURLMOPT_PIPELINING(3) enabled
for the multi handle this transfer is associated with - libcurl instead
waits for the connection to reveal if it is possible to multiplex on be-
fore it continues. This enables libcurl to much better keep the number
of connections to a minimum when using multiplexing protocols.
With this option set, libcurl prefers to wait and reuse an existing con-
nection for multiplexing rather than the opposite: prefer to open a new
connection rather than waiting.
The waiting time is as long as it takes for the connection to get up and
for libcurl to get the necessary response back that informs it about its
protocol and support level.
DEFAULT
0 (off)
PROTOCOLS
This functionality affects http only
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_PIPEWAIT, 1L);
/* now add this easy handle to the multi handle */
}
}
AVAILABILITY
Added in curl 7.43.0
RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3).
SEE ALSO
CURLMOPT_MAX_HOST_CONNECTIONS(3), CURLMOPT_PIPELINING(3), CURLOPT_FOR-
BID_REUSE(3), CURLOPT_FRESH_CONNECT(3)
libcurl 2026-07-12 CURLOPT_PIPEWAIT(3)
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