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.TH CURLOPT_PIPEWAIT 3 "November 04, 2020" "libcurl 7.77.0" "curl_easy_setopt options"

.SH NAME
CURLOPT_PIPEWAIT \- wait for pipelining/multiplexing
.SH SYNOPSIS
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PIPEWAIT, long wait);
.SH DESCRIPTION
Set \fIwait\fP to 1L to tell libcurl to prefer to wait for a connection to
confirm or deny that it can do pipelining or multiplexing before continuing.

When about to perform a new transfer that allows pipelining or multiplexing,
libcurl will check for existing connections to re-use and pipeline on. If no
such connection exists it will immediately continue and create a fresh new
connection to use.

By setting this option to 1 - and having \fICURLMOPT_PIPELINING(3)\fP enabled
for the multi handle this transfer is associated with - libcurl will instead
wait for the connection to reveal if it is possible to pipeline/multiplex on
before it continues. This enables libcurl to much better keep the number of
connections to a minimum when using pipelining or multiplexing protocols.

The effect thus becomes that with this option set, libcurl prefers to wait and
re-use an existing connection for pipelining 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.
.SH DEFAULT
0 (off)
.SH PROTOCOLS
HTTP(S)
.SH EXAMPLE
.SH AVAILABILITY
Added in 7.43.0
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLOPT_FORBID_REUSE "(3), " CURLOPT_FRESH_CONNECT "(3), "
.BR CURLMOPT_PIPELINING "(3), " CURLMOPT_MAX_HOST_CONNECTIONS "(3), "
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