id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 29872 ConnectionAbortedError from Chrome cancelled preload William Hingston nobody "Using the following code in a [https://developers.google.com/web/updates/2017/02/navigation-preload service worker to preload]: {{{ addEventListener('activate', event => { event.waitUntil(async function() { // Feature-detect if (self.registration.navigationPreload) { // Enable navigation preloads! await self.registration.navigationPreload.enable(); } }()); }); }}} Gives the following error when the page is cached by the service worker and you F5 it attempts to preload and then cancels when the service worker boots up: {{{ ""C:\Program Files\JetBrains\PyCharm 2018.2.4\bin\runnerw.exe"" C:\Users\Will\AppData\Local\Programs\Python\Python37-32\python.exe C:/Users/Will/PycharmProjects/lolnames.gg/manage.py runserver 8000 Performing system checks... System check identified no issues (0 silenced). October 21, 2018 - 12:21:51 Django version 2.1.2, using settings 'lolnamesgg.settings' Starting development server at http://127.0.0.1:8000/ Quit the server with CTRL-BREAK. [21/Oct/2018 12:21:56] ""GET /en/ HTTP/1.1"" 200 11402 Traceback (most recent call last): File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 138, in run self.finish_response() File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 180, in finish_response self.write(data) File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 274, in write self.send_headers() File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 332, in send_headers self.send_preamble() File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 255, in send_preamble ('Date: %s\r\n' % format_date_time(time.time())).encode('iso-8859-1') File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 453, in _write result = self.stdout.write(data) File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\socketserver.py"", line 796, in write self._sock.sendall(b) ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine [21/Oct/2018 12:21:56] ""GET /en/ HTTP/1.1"" 500 59 ---------------------------------------- Exception happened during processing of request from ('127.0.0.1', 51128) Traceback (most recent call last): File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 138, in run self.finish_response() File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 180, in finish_response self.write(data) File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 274, in write self.send_headers() File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 332, in send_headers self.send_preamble() File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 255, in send_preamble ('Date: %s\r\n' % format_date_time(time.time())).encode('iso-8859-1') File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 453, in _write result = self.stdout.write(data) File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\socketserver.py"", line 796, in write self._sock.sendall(b) ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine During handling of the above exception, another exception occurred: Traceback (most recent call last): File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 141, in run self.handle_error() File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\servers\basehttp.py"", line 86, in handle_error super().handle_error() File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 368, in handle_error self.finish_response() File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 180, in finish_response self.write(data) File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 274, in write self.send_headers() File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 331, in send_headers if not self.origin_server or self.client_is_modern(): File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 344, in client_is_modern return self.environ['SERVER_PROTOCOL'].upper() != 'HTTP/0.9' TypeError: 'NoneType' object is not subscriptable During handling of the above exception, another exception occurred: Traceback (most recent call last): File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\socketserver.py"", line 647, in process_request_thread self.finish_request(request, client_address) File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\socketserver.py"", line 357, in finish_request self.RequestHandlerClass(request, client_address, self) File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\socketserver.py"", line 717, in __init__ self.handle() File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\servers\basehttp.py"", line 154, in handle handler.run(self.server.get_app()) File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\handlers.py"", line 144, in run self.close() File ""C:\Users\Will\AppData\Local\Programs\Python\Python37-32\lib\wsgiref\simple_server.py"", line 35, in close self.status.split(' ',1)[0], self.bytes_sent AttributeError: 'NoneType' object has no attribute 'split' ---------------------------------------- }}} Windows 10 Chrome 70 Django 2.1 Python 3.7 " Bug closed HTTP handling 2.1 Normal needsinfo ConnectionAbortedError Preload Unreviewed 0 0 0 0 0 0