CURLOPT_STREAM_DEPENDS(3)  curl_easy_setopt options  CURLOPT_STREAM_DEPENDS(3)

NAME
       CURLOPT_STREAM_DEPENDS - set 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
       _STREAM_DEPENDS_E&section=3">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 will cause this function
       to return an error. It must be another easy handle, and it also needs
       to be a handle of a transfer that will be sent over the same HTTP/2
       connection for this option to have an actual effect.

DEFAULT
       NULL

PROTOCOLS
       HTTP/2

EXAMPLE
       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 7.46.0

RETURN VALUE
       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
       if not.

SEE ALSO
       CURLOPT_STREAM_WEIGHT(3), CURLOPT_STREAM_DEPENDS_E(3),

libcurl 7.77.0                 November 4, 2020      CURLOPT_STREAM_DEPENDS(3)