Function libnghttp2_sys::nghttp2_session_callbacks_set_before_frame_send_callback

pub unsafe extern "C" fn nghttp2_session_callbacks_set_before_frame_send_callback(
    cbs: *mut nghttp2_session_callbacks, 
    before_frame_send_callback: nghttp2_before_frame_send_callback
)

@function

Sets callback function invoked before a non-DATA frame is sent.