CURLOPT_STREAM_DEPENDS - stream this transfer depends on

Added in curl 7.46.0

NULL

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.

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 */ } }

CURLOPT_STREAM_DEPENDS - stream this transfer depends on

This functionality affects http only

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).

CURLMOPT_PIPELINING(3), CURLOPT_HTTP_VERSION(3), CURLOPT_STREAM_DEPENDS_E(3), CURLOPT_STREAM_WEIGHT(3) libcurl 2025-06-16 CURLOPT_STREAM_DEPENDS(3)

#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STREAM_DEPENDS, CURL *dephandle);