81 lines
2.9 KiB
Groff
81 lines
2.9 KiB
Groff
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_PIPEWAIT 3 "12 May 2015" libcurl libcurl
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.SH NAME
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CURLOPT_PIPEWAIT \- wait for multiplexing
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PIPEWAIT, long wait);
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.fi
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.SH DESCRIPTION
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Set \fIwait\fP to 1L to tell libcurl to prefer to wait for a connection to
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confirm or deny that it can do multiplexing before continuing.
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When about to perform a new transfer that allows multiplexing, libcurl checks
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for existing connections to use. If no such connection exists it immediately
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continues and creates a fresh new connection to use.
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By setting this option to 1 - and having \fICURLMOPT_PIPELINING(3)\fP enabled
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for the multi handle this transfer is associated with - libcurl instead waits
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for the connection to reveal if it is possible to multiplex on before it
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continues. This enables libcurl to much better keep the number of connections
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to a minimum when using multiplexing protocols.
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With this option set, libcurl prefers to wait and reuse an existing connection
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for multiplexing rather than the opposite: prefer to open a new connection
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rather than waiting.
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The waiting time is as long as it takes for the connection to get up and for
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libcurl to get the necessary response back that informs it about its protocol
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and support level.
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.SH DEFAULT
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0 (off)
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.SH PROTOCOLS
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HTTP(S)
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.SH EXAMPLE
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.nf
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
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curl_easy_setopt(curl, CURLOPT_PIPEWAIT, 1L);
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/* now add this easy handle to the multi handle */
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}
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}
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.fi
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.SH AVAILABILITY
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Added in 7.43.0
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLMOPT_MAX_HOST_CONNECTIONS (3),
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.BR CURLMOPT_PIPELINING (3),
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.BR CURLOPT_FORBID_REUSE (3),
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.BR CURLOPT_FRESH_CONNECT (3)
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