CURLOPT_STREAM_WEIGHT(3) Library Functions Manual CURLOPT_STREAM_WEIGHT(3)
NAME
CURLOPT_STREAM_WEIGHT - numerical stream weight
SYNOPSIS
#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 par-
ticular 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 proportion-
ally 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
16
PROTOCOLS
This functionality affects http only
EXAMPLE
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 curl 7.46.0
RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3).
SEE ALSO
CURLMOPT_PIPELINING(3), CURLOPT_PIPEWAIT(3), CURLOPT_STREAM_DEPENDS(3),
CURLOPT_STREAM_DEPENDS_E(3)
libcurl 2026-07-12 CURLOPT_STREAM_WEIGHT(3)
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