html-with-early-hints.h2.py (815B)
1 def handle_headers(frame, request, response): 2 resource_url = request.GET.first(b"resource-url").decode() 3 link_header_value = "<{}>; rel=preload; as=script".format(resource_url) 4 early_hints = [ 5 (b":status", b"103"), 6 (b"link", link_header_value), 7 ] 8 response.writer.write_raw_header_frame(headers=early_hints, 9 end_headers=True) 10 11 response.status = 200 12 response.headers[b"content-type"] = "text/html" 13 if b"x-frame-options" in request.GET: 14 x_frame_options = request.GET.first(b"x-frame-options").decode() 15 response.headers[b"x-frame-options"] = x_frame_options 16 response.write_status_headers() 17 18 19 def main(request, response): 20 content = "<!-- empty -->" 21 response.writer.write_data(item=content, last=True)