236483 2022-02-10 21:42:16 -0800 In standalone mode (PWA), page won't load when navigation preload is enabled 2022-03-01 11:54:15 -0800 1 1 1 Unclassified WebKit Service Workers Safari 15 iPhone / iPad iOS 15 RESOLVED WORKSFORME InRadar P2 Normal --- 1 howu webkit-unassigned achristensen cdumez jameshoward smoley webkit-bug-importer youennf oldest_to_newest 1840190 0 451639 howu 2022-02-10 21:42:16 -0800 Created attachment 451639 Minimal test page On iOS 15.4 (beta), when a page runs in standalone mode with navigation preload enabled, the `preloadResponse` of the navigation request to `start_url` is a 200 with an empty response body. If the service worker responds to the navigation request with this empty `preloadResponse`, the site cannot be loaded and the app results in a blank white screen. This issue is not observed in non-standalone mode, nor in OS versions lower than 15.4. Attached is a minimal test page that exhibits the issue. Repro steps: 1. Create a standalone homescreen icon to the attached site (on devices/simulators running iOS 15.4) 2. Open the homescreen icon and observe that the page is loaded 3. Swipe out the page and open it again (this time service worker is activated) 4. Observe that the page is not loaded 1841548 1 webkit-bug-importer 2022-02-14 19:54:46 -0800 <rdar://problem/88943495> 1841564 2 howu 2022-02-14 20:17:02 -0800 After playing with the minimal test page more, I found that sometimes the issue can be reproduced in non-standalone mode as well. Unlike in standalone mode where this issue always happens, in non-standalone mode, it doesn't always fall into this problematic state. However, once I reproduce this issue in non-standalone, opening a new tab and navigating to the page would always result in this issue. I cannot find a proper way to fix/workaround this issue, and would appreciate if you could shed some light on this. I uploaded the test page for your convenience. https://wuchenhao.github.io/empty-preload-response/index.html 1846136 3 smoley 2022-02-25 12:20:33 -0800 Thanks for filing, I've not been able to reproduce this on iOS 15.4 beta 4 (19E5235a) in a standalone PWA. Are you still seeing this on the latest beta? 1846922 4 howu 2022-02-28 22:15:12 -0800 I am not able to reproduce this on iOS 15.4 beta 4 either. Thanks for the update! 451639 2022-02-10 21:42:16 -0800 2022-02-10 21:42:16 -0800 Minimal test page empty-preload-response.zip application/zip 2870 howu UEsDBBQAAAAAAEtoS1QAAAAAAAAAAAAAAAAXACAAZW1wdHktcHJlbG9hZC1yZXNwb25zZS9VVA0A B9/tBWLg7QVix/EFYnV4CwABBPYBAAAEFAAAAFBLAwQUAAgACABMaEtUAAAAAAAAAAAPAgAAIQAg AGVtcHR5LXByZWxvYWQtcmVzcG9uc2UvaW5kZXguaHRtbFVUDQAH4O0FYtXxBWLg7QVidXgLAAEE 9gEAAAQUAAAAhZE9T8QwDIb3+xW57G11G0PaBW7mhFgY3dRtA/lSbIT670kvgpYTiCyOv97HstXx 4fH++eVyFjM72x3UaoQFP7USvewOIj81Iwzle3UdMgg9QyLkVr7zWN1J0ewKrPFvIqFtpQNvRiSW Yk44bn79gf2W0ykQhWQm47MeYaUTDujZgKWfymzYYnd2kRcRMyHA8IQUgydUTUnezOnBYSshRouV C73JJrOrHKg0ROgtZn7wnHGtXPCG95/EFbkT+HWyv5ZDvFikGfF7PSVSa9rGUE3ZfnH6MCw7rfnU XWBCYUisQByOufz01bgVK9LJRBaU9HoD4+tXkp1qSjifvSnn/wRQSwcIp/4oswEBAAAPAgAAUEsD BBQACAAIADyHSlQAAAAAAAAAAAQYAAAgACAAZW1wdHktcHJlbG9hZC1yZXNwb25zZS8uRFNfU3Rv cmVVVA0AB5TTBGIQ1gRilNMEYnV4CwABBPYBAAAEFAAAAO2YOw7CMBBEZ0OEItG4pPQVuIGF4ARc gG8XiSLQp+JcHI1EO3ykQBEaEMyLVq/IrmM3tjcAbHrcToAAoIAbJzylYHTIaPNoxjig2labcr3f l8/H6tDWDrFC1Ty7N+qFEEII0Q9zFaPPTkMI8YW0+0OkE127je8zOn+oCXSkE127jXkZndMFHehI J7p2c9MyNh/GLxs7FAt0pFOvJQvxNwxcoT3/53jZ/wshfhjLZ4vZFLeGoEN71sYmlsw5XwtfXAQy /2E4xj0v0omu3boMCPEJLlBLBwjhP7Sc0gAAAAQYAABQSwMEFAAIAAgAPIdKVAAAAAAAAAAAeAAA ACsAIABfX01BQ09TWC9lbXB0eS1wcmVsb2FkLXJlc3BvbnNlLy5fLkRTX1N0b3JlVVQNAAeU0wRi ENYEYtnxBWJ1eAsAAQT2AQAABBQAAABjYBVjZ2BiYPBNTFbwD1aIUIACkBgDJxAbAbEbEIP4FUDM AFPhIMCAAziGhARBmRUwXegAAFBLBwgLiMA4NQAAAHgAAABQSwMEFAAIAAgAhmhLVAAAAAAAAAAA JAAAACEAIABlbXB0eS1wcmVsb2FkLXJlc3BvbnNlL3N0eWxlcy5jc3NVVA0AB03uBWLV8QViTe4F YnV4CwABBPYBAAAEFAAAAMswVKjmUgCCpMTk7PSi/NK8FN3k/Jz8IiuFytScnPxya65aAFBLBwj4 4yGfJAAAACQAAABQSwMEFAAIAAgAdWJLVAAAAAAAAAAAswAAAB4AIABlbXB0eS1wcmVsb2FkLXJl c3BvbnNlL21haW4uanNVVA0AB97jBWLV8QVi3uMFYnV4CwABBPYBAAAEFAAAAFWOMQqAMAxFd0+R rXbpBUSv4SiisUalgbToIN7dKlrxTSE/eXwaIFceZaUOa5YZRQE5cO1Ktg0sGvYMImlhfsd3dmEE LfmAEm2bmbzSXxRGdHkDZfW4Xjp2nhc0C9vUAbbbC68Oe6WL9HXE+TgBUEsHCHoxXMRuAAAAswAA AFBLAwQUAAgACAAhYktUAAAAAAAAAABmAAAAKwAgAGVtcHR5LXByZWxvYWQtcmVzcG9uc2UvbWFu aWZlc3Qud2VibWFuaWZlc3RVVA0ABz/jBWLV8QViP+MFYnV4CwABBPYBAAAEFAAAAKvmUgACpbzE 3FQlKwUl19yCkkqFgqLUnPzElKDU4oL8vOJUJR2IopTM4oKcxEqQuuKSxLyUxJz8PLgkUKSoJL60 KAckraefmZeSWqGXUZKbo8RVywUAUEsHCIJcmndWAAAAZgAAAFBLAwQUAAgACADEZUtUAAAAAAAA AADWAgAAHAAgAGVtcHR5LXByZWxvYWQtcmVzcG9uc2Uvc3cuanNVVA0ABxDqBWLV8QViEOoFYnV4 CwABBPYBAAAEFAAAAG1RzWrDMAy+9yk0GMSB4gdYyQ6F3XoYg7Fr3VhJDJ7c2UpLaPPuc+ImbdcJ Akb59P1IAW0lldZvByTemMBI6EWmSjYHxZgtAYc/ULzCaQGxSkfBWZTW1SILR5iQOstXI2DEy6My /ElsrBibQ4VBymMdRbxi40iSOph6fL57tE5piaR2FkUuuUESIr/qTnWnfyWAfWKAxDC7GarPl+M7 tvr4LcL/mSvksnkMbCoQKZPHnxYDy2+nEZ6KAiZ9zOB8vgS/+PjAsI9OEYqIa0ljZQh1fhPGI7ee kst+8bjbNhiq51j+wvcyGZzdtN7ebT4h9ZfhRqjQUQlVS+W4I3GrP4jxzAsFqOFm/6dY3U1NFrd/ zUFgxW0onk9TR6ZOv4Sd0926Y9wg1dxEiEh6M7K0jobLK+9Vt26rKt4kz+Vunum3NzdN25unL2uM A+ONfwFQSwcI5/QlpE4BAADWAgAAUEsBAhQDFAAAAAAAS2hLVAAAAAAAAAAAAAAAABcAIAAAAAAA AAAAAO1BAAAAAGVtcHR5LXByZWxvYWQtcmVzcG9uc2UvVVQNAAff7QVi4O0FYsfxBWJ1eAsAAQT2 AQAABBQAAABQSwECFAMUAAgACABMaEtUp/4oswEBAAAPAgAAIQAgAAAAAAAAAAAApIFVAAAAZW1w dHktcHJlbG9hZC1yZXNwb25zZS9pbmRleC5odG1sVVQNAAfg7QVi1fEFYuDtBWJ1eAsAAQT2AQAA BBQAAABQSwECFAMUAAgACAA8h0pU4T+0nNIAAAAEGAAAIAAgAAAAAAAAAAAApIHFAQAAZW1wdHkt cHJlbG9hZC1yZXNwb25zZS8uRFNfU3RvcmVVVA0AB5TTBGIQ1gRilNMEYnV4CwABBPYBAAAEFAAA AFBLAQIUAxQACAAIADyHSlQLiMA4NQAAAHgAAAArACAAAAAAAAAAAACkgQUDAABfX01BQ09TWC9l bXB0eS1wcmVsb2FkLXJlc3BvbnNlLy5fLkRTX1N0b3JlVVQNAAeU0wRiENYEYtnxBWJ1eAsAAQT2 AQAABBQAAABQSwECFAMUAAgACACGaEtU+OMhnyQAAAAkAAAAIQAgAAAAAAAAAAAApIGzAwAAZW1w dHktcHJlbG9hZC1yZXNwb25zZS9zdHlsZXMuY3NzVVQNAAdN7gVi1fEFYk3uBWJ1eAsAAQT2AQAA BBQAAABQSwECFAMUAAgACAB1YktUejFcxG4AAACzAAAAHgAgAAAAAAAAAAAApIFGBAAAZW1wdHkt cHJlbG9hZC1yZXNwb25zZS9tYWluLmpzVVQNAAfe4wVi1fEFYt7jBWJ1eAsAAQT2AQAABBQAAABQ SwECFAMUAAgACAAhYktUglyad1YAAABmAAAAKwAgAAAAAAAAAAAApIEgBQAAZW1wdHktcHJlbG9h ZC1yZXNwb25zZS9tYW5pZmVzdC53ZWJtYW5pZmVzdFVUDQAHP+MFYtXxBWI/4wVidXgLAAEE9gEA AAQUAAAAUEsBAhQDFAAIAAgAxGVLVOf0JaROAQAA1gIAABwAIAAAAAAAAAAAAKSB7wUAAGVtcHR5 LXByZWxvYWQtcmVzcG9uc2Uvc3cuanNVVA0ABxDqBWLV8QViEOoFYnV4CwABBPYBAAAEFAAAAFBL BQYAAAAACAAIAHkDAACnBwAAAAA=