png-with-early-hints.h2.py (906B)
1 import os 2 import time 3 4 def handle_headers(frame, request, response): 5 resource_url = request.GET.first(b"resource-url").decode() 6 link_header_value = "<{}>; rel=preload; as=script".format(resource_url) 7 early_hints = [ 8 (b":status", b"103"), 9 (b"link", link_header_value), 10 ] 11 response.writer.write_raw_header_frame(headers=early_hints, 12 end_headers=True) 13 14 # Sleep to simulate a slow generation of the final response. 15 time.sleep(0.1) 16 response.status = 200 17 response.headers[b"content-type"] = "image/png" 18 response.write_status_headers() 19 20 21 def main(request, response): 22 current_dir = os.path.dirname(os.path.realpath(__file__)) 23 file_path = os.path.join(current_dir, "square.png") 24 with open(file_path, "rb") as f: 25 test_content = f.read() 26 response.writer.write_data(item=test_content, last=True)