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77 lines
3.1 KiB
Groff
77 lines
3.1 KiB
Groff
.\" **************************************************************************
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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) 1998 - 2017, 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.haxx.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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.\" **************************************************************************
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.\"
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.TH CURLOPT_STREAM_WEIGHT 3 "13 Sep 2015" "libcurl 7.46.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_STREAM_WEIGHT \- set numerical stream weight
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STREAM_WEIGHT, long weight);
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.SH DESCRIPTION
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Set the long \fIweight\fP to a number between 1 and 256.
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When using HTTP/2, this option sets the individual weight for this particular
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stream used by the easy \fIhandle\fP. Setting and using weights only makes
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sense and is only usable when doing multiple streams over the same
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connections, which thus implies that you use \fICURLMOPT_PIPELINING(3)\fP.
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This option can be set during transfer and will then cause the updated weight
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info get sent to the server the next time a HTTP/2 frame is sent to the
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server.
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See section 5.3 of RFC 7540 for protocol details:
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https://httpwg.github.io/specs/rfc7540.html#StreamPriority
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Streams with the same parent should be allocated resources proportionally
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based on their weight. So if you have two streams going, stream A with weight
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16 and stream B with weight 32, stream B will get two thirds (32/48) of the
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available bandwidth (assuming the server can send off the data equally for
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both streams).
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.SH DEFAULT
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If nothing is set, the HTTP/2 protocol itself will use its own default which
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is 16.
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.SH PROTOCOLS
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HTTP/2
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.SH EXAMPLE
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.nf
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CURL *curl = curl_easy_init();
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CURL *curl2 = curl_easy_init(); /* a second handle */
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/one");
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curl_easy_setopt(curl, CURLOPT_STREAM_WEIGHT, 10L);
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/* the second has twice the weight */
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curl_easy_setopt(curl2, CURLOPT_URL, "https://example.com/two");
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curl_easy_setopt(curl2, CURLOPT_STREAM_WEIGHT, 20L);
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/* then add both to a multi handle and transfer them! */
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}
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.fi
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.SH AVAILABILITY
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Added in 7.46.0
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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 CURLOPT_STREAM_DEPENDS "(3), " CURLOPT_STREAM_DEPENDS_E "(3), "
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.BR CURLOPT_PIPEWAIT "(3), " CURLMOPT_PIPELINING "(3), "
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