82 lines
2.0 KiB
Markdown
82 lines
2.0 KiB
Markdown
|
---
|
||
|
|
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
|
||
|
|
SPDX-License-Identifier: curl
|
||
|
|
Title: CURLOPT_STREAM_WEIGHT
|
||
|
|
Section: 3
|
||
|
|
Source: libcurl
|
||
|
|
See-also:
|
||
|
|
- CURLMOPT_PIPELINING (3)
|
||
|
|
- CURLOPT_PIPEWAIT (3)
|
||
|
|
- CURLOPT_STREAM_DEPENDS (3)
|
||
|
|
- CURLOPT_STREAM_DEPENDS_E (3)
|
||
|
|
---
|
||
|
|
|
||
|
|
# NAME
|
||
|
|
|
||
|
|
CURLOPT_STREAM_WEIGHT - numerical stream weight
|
||
|
|
|
||
|
|
# SYNOPSIS
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
#include <curl/curl.h>
|
||
|
|
|
||
|
|
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STREAM_WEIGHT, long weight);
|
||
|
|
~~~
|
||
|
|
|
||
|
|
# DESCRIPTION
|
||
|
|
|
||
|
|
Set the long *weight* to a number between 1 and 256.
|
||
|
|
|
||
|
|
When using HTTP/2, this option sets the individual weight for this particular
|
||
|
|
stream used by the easy *handle*. Setting and using weights only makes
|
||
|
|
sense and is only usable when doing multiple streams over the same
|
||
|
|
connections, which thus implies that you use CURLMOPT_PIPELINING(3).
|
||
|
|
|
||
|
|
This option can be set during transfer and causes the updated weight info get
|
||
|
|
sent to the server the next time an HTTP/2 frame is sent to the server.
|
||
|
|
|
||
|
|
See section 5.3 of RFC 7540 for protocol details.
|
||
|
|
|
||
|
|
Streams with the same parent should be allocated resources proportionally
|
||
|
|
based on their weight. If you have two streams going, stream A with weight 16
|
||
|
|
and stream B with weight 32, stream B gets two thirds (32/48) of the available
|
||
|
|
bandwidth (assuming the server can send off the data equally for both
|
||
|
|
streams).
|
||
|
|
|
||
|
|
# DEFAULT
|
||
|
|
|
||
|
|
If nothing is set, the HTTP/2 protocol itself uses its own default which is
|
||
|
|
16.
|
||
|
|
|
||
|
|
# PROTOCOLS
|
||
|
|
|
||
|
|
HTTP/2
|
||
|
|
|
||
|
|
# EXAMPLE
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
int main(void)
|
||
|
|
{
|
||
|
|
CURL *curl = curl_easy_init();
|
||
|
|
CURL *curl2 = curl_easy_init(); /* a second handle */
|
||
|
|
if(curl) {
|
||
|
|
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/one");
|
||
|
|
curl_easy_setopt(curl, CURLOPT_STREAM_WEIGHT, 10L);
|
||
|
|
|
||
|
|
/* the second has twice the weight */
|
||
|
|
curl_easy_setopt(curl2, CURLOPT_URL, "https://example.com/two");
|
||
|
|
curl_easy_setopt(curl2, CURLOPT_STREAM_WEIGHT, 20L);
|
||
|
|
|
||
|
|
/* then add both to a multi handle and transfer them! */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
~~~
|
||
|
|
|
||
|
|
# AVAILABILITY
|
||
|
|
|
||
|
|
Added in 7.46.0
|
||
|
|
|
||
|
|
# RETURN VALUE
|
||
|
|
|
||
|
|
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
|