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CURLOPT_STREAM_DEPENDS(3)   Library Functions Manual   CURLOPT_STREAM_DEPENDS(3)

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  ex-
     clusive  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
     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_HTTP_VERSION(3),     CURLOPT_STREAM_DE-
     PENDS_E(3), CURLOPT_STREAM_WEIGHT(3)

libcurl 			   2026-06-11	       CURLOPT_STREAM_DEPENDS(3)

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