romenskiy2012/curl

mirror of https://github.com/curl/curl.git synced 2026-06-02 22:04:17 +03:00

http2: remove stream dependency tracking

The HTTP/2 feature is deprecated, few servers implement it and our
implementation is complicated by its state management. Make the two
CURLOPT_* involved a nop and deprecate them.

Closes #21723

2026-05-22 09:44:08 +02:00

2.1 KiB

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SPDX-License-Identifier

Title

Section

Source

See-also

Protocol

Added-in

curl

CURLOPT_STREAM_DEPENDS

libcurl

CURLMOPT_PIPELINING (3)

CURLOPT_HTTP_VERSION (3)

CURLOPT_STREAM_DEPENDS_E (3)

CURLOPT_STREAM_WEIGHT (3)

HTTP

7.46.0

NAME

CURLOPT_STREAM_DEPENDS - stream this transfer depends on

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STREAM_DEPENDS,
                          CURL *dephandle);

DESCRIPTION

Pass a CURL pointer in dephandle to identify the stream within the same connection that this stream is depending upon. This option clears the exclusive bit and is mutually exclusive to the CURLOPT_STREAM_DEPENDS_E(3) option.

The spec says "Including a dependency expresses a preference to allocate resources to the identified stream rather than to the dependent stream."

This option can be set during transfer.

dephandle must not be the same as handle, that makes this function return an error. It must be another easy handle, and it also needs to be a handle of a transfer that is about to be sent over the same HTTP/2 connection for this option to have an actual effect.

Since version 8.21.0 setting this option no longer has an effect. HTTP/2 stream dependencies were introduced in RFC 7540 and then later deprecated in RFC 9113.

DEFAULT

NULL

%PROTOCOLS%

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");

    /* the second depends on the first */
    curl_easy_setopt(curl2, CURLOPT_URL, "https://example.com/two");
    curl_easy_setopt(curl2, CURLOPT_STREAM_DEPENDS, curl);

    /* then add both to a multi handle and transfer them */
  }
}

DEPRECATED

Deprecated since 8.21.0.

%AVAILABILITY%

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).

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