83 lines
1.7 KiB
Markdown
83 lines
1.7 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLMOPT_PIPELINING
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Section: 3
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Source: libcurl
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See-also:
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- CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE (3)
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- CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE (3)
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- CURLMOPT_MAXCONNECTS (3)
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- CURLMOPT_MAX_HOST_CONNECTIONS (3)
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- CURLMOPT_MAX_PIPELINE_LENGTH (3)
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- CURLMOPT_PIPELINING_SITE_BL (3)
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Protocol:
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- HTTP
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Added-in: 7.16.0
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---
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# NAME
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CURLMOPT_PIPELINING - enable HTTP multiplexing
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_PIPELINING, long bitmask);
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~~~
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# DESCRIPTION
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Pass in the correct value in the **bitmask** parameter to instruct libcurl to
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enable multiplexing for this multi handle.
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With multiplexing enabled, libcurl attempts to do multiple transfers over the
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same connection when doing parallel transfers to the same hosts.
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## CURLPIPE_NOTHING (0)
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Default, which means doing no attempts at multiplexing.
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## CURLPIPE_HTTP1 (1)
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This bit is deprecated and has no effect since version 7.62.0.
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## CURLPIPE_MULTIPLEX (2)
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If this bit is set, libcurl tries to multiplex the new transfer over an
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existing connection if possible. This requires HTTP/2 or HTTP/3.
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# DEFAULT
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**CURLPIPE_MULTIPLEX**
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURLM *m = curl_multi_init();
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/* try HTTP/2 multiplexing */
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curl_multi_setopt(m, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
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}
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~~~
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# HISTORY
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The multiplex support bit was added in 7.43.0. HTTP/1 Pipelining support was
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disabled in 7.62.0.
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Since 7.62.0, **CURLPIPE_MULTIPLEX** is enabled by default.
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Before that, default was **CURLPIPE_NOTHING**.
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# %AVAILABILITY%
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# RETURN VALUE
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Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
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