int nghttp2_session_change_stream_priority(nghttp2_session *session, int32_t stream_id, const nghttp2_priority_spec *pri_spec)
Changes priority of existing stream denoted by stream_id. The new priority specification is pri_spec.
The priority is changed silently and instantly, and no PRIORITY frame will be sent to notify the peer of this change. This function may be useful for server to change the priority of pushed stream.
If session is initialized as server, and
pri_spec->stream_idpoints to the idle stream, the idle stream is created if it does not exist. The created idle stream will depend on root stream (stream 0) with weight 16.
Otherwise, if stream denoted by
pri_spec->stream_idis not found, we use default priority instead of given pri_spec. That is make stream depend on root stream with weight 16.
nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIESof value of 1 is submitted via
nghttp2_submit_settings(), this function does nothing and returns 0.
This function returns 0 if it succeeds, or one of the following negative error codes: