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CURLOPT_STREAM_DEPENDS_E(3) curl_easy_setopt options
CURLOPT_STREAM_DEPENDS_E - set stream this transfer depends on
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STREAM_DEPENDS_E, CURL
Pass a CURL * pointer in dephandle to identify the stream within the
same connection that this stream is depending upon exclusively. That
means it depends on it and sets the Exclusive bit.
The spec says "Including a dependency expresses a preference to
allocate resources to the identified stream rather than to the
Setting a dependency with the exclusive flag for a reprioritized stream
causes all the dependencies of the new parent stream to become
dependent on the reprioritized 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.
CURL *curl = curl_easy_init();
CURL *curl2 = curl_easy_init(); /* a second handle */
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_E, curl);
/* then add both to a multi handle and transfer them! */
Added in 7.46.0
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
libcurl 7.73.0 March 23, 2020 CURLOPT_STREAM_DEPENDS_E(3)