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
       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                           2024-09-18         CURLOPT_STREAM_DEPENDS(3)