log

[ +325 ms]       Failed to load asset at path: packages/build_web_compilers/src/dev_compiler/dart_sdk.js.

                          Status code: 404

                          Headers:
                          {
                      "date": "Tue, 19 Nov 2019 17:25:39 GMT",
                      "content-length": "9",
                      "x-frame-options": "SAMEORIGIN",
                      "content-type": "text/plain; charset=utf-8",
                      "x-xss-protection": "1; mode=block",
                      "x-content-type-options": "nosniff",
                      "server": "dart:io with Shelf",
                      "via": "1.1 shelf_proxy"
                    }

                          Content:
                          Not Found}

[  +43 ms] Attempting to connect to browser instance.. (completed in 6.7s)
[   +1 ms] Warning: Flutter's support for web development is not stable yet and hasn't
[        ] been thoroughly tested in production environments.
[        ] For more information see https://flutter.dev/web
[   +1 ms] 🔥  To hot restart changes while running, press "r". To hot restart (and refresh the browser), press "R".
[   +1 ms] For a more detailed help message, press "h". To quit, press "q".
[   +5 ms] Debug service listening on ws://127.0.0.1:53481/MiR7PfHF8Bk=