79 lines
1.9 KiB
Markdown
79 lines
1.9 KiB
Markdown
|
---
|
||
|
|
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
|
||
|
|
SPDX-License-Identifier: curl
|
||
|
|
Title: CURLOPT_PIPEWAIT
|
||
|
|
Section: 3
|
||
|
|
Source: libcurl
|
||
|
|
See-also:
|
||
|
|
- CURLMOPT_MAX_HOST_CONNECTIONS (3)
|
||
|
|
- CURLMOPT_PIPELINING (3)
|
||
|
|
- CURLOPT_FORBID_REUSE (3)
|
||
|
|
- CURLOPT_FRESH_CONNECT (3)
|
||
|
|
---
|
||
|
|
|
||
|
|
# NAME
|
||
|
|
|
||
|
|
CURLOPT_PIPEWAIT - wait for multiplexing
|
||
|
|
|
||
|
|
# SYNOPSIS
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
#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 before 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 connection
|
||
|
|
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
|
||
|
|
|
||
|
|
HTTP(S)
|
||
|
|
|
||
|
|
# EXAMPLE
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
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 7.43.0
|
||
|
|
|
||
|
|
# RETURN VALUE
|
||
|
|
|
||
|
|
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
|