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53 <p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
54 <p class="level0">CURLMOPT_PIPELINING - enable HTTP pipelining and multiplexing <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
55 <p class="level0">#include <curl/curl.h>
56 <p class="level0">CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_PIPELINING, long bitmask); <a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
57 <p class="level0">Pass in the <span Class="bold">bitmask</span> parameter to instruct libcurl to enable HTTP pipelining and/or HTTP/2 multiplexing for this multi handle.
58 <p class="level0">When enabled, libcurl will attempt to use those protocol features when doing parallel requests to the same hosts.
59 <p class="level0">For pipelining, this means that if you add a second request that can use an already existing connection, the second request will be "piped" on the same connection rather than being executed in parallel.
60 <p class="level0">For multiplexing, this means that follow-up requests can re-use an existing connection and send the new request multiplexed over that at the same time as other transfers are already using that single connection.
61 <p class="level0">There are several other related options that are interesting to tweak and adjust to alter how libcurl spreads out requests on different connections or not etc.
62 <p class="level0">Before 7.43.0, this option was set to 1 and 0 to enable and disable HTTP/1.1 pipelining.
63 <p class="level0">Starting in 7.43.0, <span Class="bold">bitmask</span>'s second bit also has a meaning, and you can ask for pipelining and multiplexing independently of each other by toggling the correct bits.
64 <p class="level0"><a name="CURLPIPENOTHING"></a><span class="nroffip">CURLPIPE_NOTHING (0)</span>
65 <p class="level1">Default, which means doing no attempts at pipelining or multiplexing.
66 <p class="level0"><a name="CURLPIPEHTTP1"></a><span class="nroffip">CURLPIPE_HTTP1 (1)</span>
67 <p class="level1">If this bit is set, libcurl will try to pipeline HTTP/1.1 requests on connections that are already established and in use to hosts.
68 <p class="level0"><a name="CURLPIPEMULTIPLEX"></a><span class="nroffip">CURLPIPE_MULTIPLEX (2)</span>
69 <p class="level1">If this bit is set, libcurl will try to multiplex the new transfer over an existing connection if possible. This requires HTTP/2. <a name="DEFAULT"></a><h2 class="nroffsh">DEFAULT</h2>
70 <p class="level0">0 (both pipeline and multiplexing are off) <a name="PROTOCOLS"></a><h2 class="nroffsh">PROTOCOLS</h2>
71 <p class="level0">HTTP(S) <a name="EXAMPLE"></a><h2 class="nroffsh">EXAMPLE</h2>
72 <p class="level0">TODO <a name="AVAILABILITY"></a><h2 class="nroffsh">AVAILABILITY</h2>
73 <p class="level0">Added in 7.16.0. Multiplex support bit added in 7.43.0. <a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
74 <p class="level0">Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not. <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
75 <p class="level0"><a Class="manpage" href="./CURLMOPT_MAX_PIPELINE_LENGTH.html">CURLMOPT_MAX_PIPELINE_LENGTH</a>, <a Class="manpage" href="./CURLMOPT_PIPELINING_SITE_BL.html">CURLMOPT_PIPELINING_SITE_BL</a>, <a Class="manpage" href="./CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE.html">CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE</a>, <a Class="manpage" href="./CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE.html">CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE</a>, <a Class="manpage" href="./CURLMOPT_MAX_HOST_CONNECTIONS.html">CURLMOPT_MAX_HOST_CONNECTIONS</a>, <a Class="manpage" href="./CURLMOPT_MAXCONNECTS.html">CURLMOPT_MAXCONNECTS</a>, <a Class="manpage" href="./CURLMOPT_MAX_HOST_CONNECTIONS.html">CURLMOPT_MAX_HOST_CONNECTIONS</a><p class="roffit">
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