void nghttp2_option_set_no_closed_streams(nghttp2_option *option, int val)
This option prevents the library from retaining closed streams to maintain the priority tree. If this option is set to nonzero, applications can discard closed stream completely to save memory.
nghttp2_settings_id.NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIESof value of 1 is submitted via
nghttp2_submit_settings(), any closed streams are not retained regardless of this option.