#include endpoint RequestClient { request_progress(i32 request_id, Optional total_size, u32 downloaded_size) =| request_finished(i32 request_id, bool success, u32 total_size) =| headers_became_available(i32 request_id, IPC::Dictionary response_headers, Optional status_code) =| // Certificate requests certificate_requested(i32 request_id) =| }