CURLOPT_STREAM_DEPENDS(3) Library Functions Manual CURLOPT_STREAM_DEPENDS(3) NAME CURLOPT_STREAM_DEPENDS - stream this transfer depends on SYNOPSIS #include 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. DEFAULT NULL 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"); /* 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 */ } } AVAILABILITY Added in curl 7.46.0 RETURN VALUE Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. SEE ALSO CURLMOPT_PIPELINING(3), CURLOPT_HTTP_VERSION(3), CURLOPT_STREAM_DEPENDS_E(3), CURLOPT_STREAM_WEIGHT(3) libcurl 2024-12-12 CURLOPT_STREAM_DEPENDS(3)