Flutter: webview_flutter_plus error: Server Error: Unsupported operation: ServerSocket.bind

Server Error: Unsupported operation: ServerSocket.bind C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 266:49 throw_
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/patch/io_patch.dart 470:5 _bind
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/io/socket.dart 307:27 bind
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_http/http_impl.dart 3161:10 bind
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_http/http.dart 186:19 bind
packages/webview_flutter_plus/src/webview_flutter_plus.dart 882:61
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/zone.dart 1391:13 _rootRun
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/zone.dart 1293:19 run
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/zone.dart 1828:67 _runZoned
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/zone.dart 1817:12 runZonedGuarded
packages/webview_flutter_plus/src/webview_flutter_plus.dart 881:5 start
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54 runBody
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5 _async
packages/webview_flutter_plus/src/webview_flutter_plus.dart 878:27 start
packages/webview_flutter_plus/src/webview_flutter_plus.dart 290:23 build
packages/flutter/src/widgets/framework.dart 4992:27 build
packages/flutter/src/widgets/framework.dart 4878:15 performRebuild
packages/flutter/src/widgets/framework.dart 5050:11 performRebuild
packages/flutter/src/widgets/framework.dart 4604:5 rebuild
packages/flutter/src/widgets/framework.dart 4859:5 [_firstBuild]
packages/flutter/src/widgets/framework.dart 5041:11 [_firstBuild]
packages/flutter/src/widgets/framework.dart 4853:5 mount
packages/flutter/src/widgets/framework.dart 3863:15 inflateWidget
packages/flutter/src/widgets/framework.dart 3592:18 updateChild
packages/flutter/src/widgets/framework.dart 6300:14 mount
packages/flutter/src/widgets/framework.dart 3863:15 inflateWidget
packages/flutter/src/widgets/framework.dart 3592:18 updateChild
packages/flutter/src/widgets/framework.dart 6300:14 mount
packages/flutter/src/widgets/framework.dart 3863:15 inflateWidget
packages/flutter/src/widgets/framework.dart 3592:18 updateChild
packages/flutter/src/widgets/framework.dart 6300:14 mount
packages/flutter/src/widgets/framework.dart 3863:15 inflateWidget
packages/flutter/src/widgets/framework.dart 3592:18 updateChild
packages/flutter/src/widgets/framework.dart 6300:14 mount
packages/flutter/src/widgets/framework.dart 3863:15 inflateWidget
packages/flutter/src/widgets/framework.dart 3592:18 updateChild
packages/flutter/src/widgets/framework.dart 6300:14 mount
packages/flutter/src/widgets/framework.dart 3863:15

Inspect packages/webview_flutter_plus/src/webview_flutter_plus.dart around start and build, especially lines 878-882, and reproduce the failure in a Flutter web build. Done means the web target no longer reaches the unsupported ServerSocket.bind operation while the webview still starts correctly.

Written by the indexing model from the issue text.