Handshake exception: Connection terminated during handshake

[devrnt]

Error defined in Play Store review and feedback mail

[devrnt]

HandshakeException: HandshakeException: Connection terminated during handshake
  File "io_client.dart", line 33, in IOClient.send
  File "<asynchronous suspension>"
  File "base_client.dart", line 169, in BaseClient._sendUnstreamed
  File "<asynchronous suspension>"
  File "base_client.dart", line 32, in BaseClient.get
  File "movie_service.dart", line 146, in MovieService.fetchAllSuggestions.<fn>
  File "iterable.dart", line 414, in MappedListIterable.elementAt
  File "iterable.dart", line 219, in ListIterable.toList
  File "movie_service.dart", line 146, in MovieService.fetchAllSuggestions
  File "async_patch.dart", line 49, in _AsyncAwaitCompleter.start
  File "movie_service.dart", line 138, in MovieService.fetchAllSuggestions
  File "suggestions_bloc.dart", line 47, in SuggestionsBloc.getSuggestions
  File "async_patch.dart", line 77, in _asyncThenWrapperHelper.<fn>
  File "zone.dart", line 1132, in _rootRunUnary
  File "zone.dart", line 1029, in _CustomZone.runUnary
  File "future_impl.dart", line 126, in _FutureListener.handleValue
  File "future_impl.dart", line 639, in Future._propagateToListeners.handleValueCallback
  File "future_impl.dart", line 668, in Future._propagateToListeners
  File "future_impl.dart", line 473, in Future._complete
  File "future_impl.dart", line 51, in _SyncCompleter.complete
  File "async_patch.dart", line 28, in _AsyncAwaitCompleter.complete
  File "async_patch.dart", line 294, in _completeOnAsyncReturn
  File "storage_service.dart", line 0, in StorageService.readFile
  File "async_patch.dart", line 77, in _asyncThenWrapperHelper.<fn>
  File "zone.dart", line 1132, in _rootRunUnary
  File "zone.dart", line 1029, in _CustomZone.runUnary
  File "future_impl.dart", line 126, in _FutureListener.handleValue
  File "future_impl.dart", line 639, in Future._propagateToListeners.handleValueCallback
  File "future_impl.dart", line 668, in Future._propagateToListeners
  File "future_impl.dart", line 483, in Future._completeWithValue
  File "future_impl.dart", line 513, in Future._asyncComplete.<fn>
  File "zone.dart", line 1124, in _rootRun
  File "zone.dart", line 1021, in _CustomZone.run
  File "zone.dart", line 923, in _CustomZone.runGuarded
  File "zone.dart", line 963, in _CustomZone.bindCallbackGuarded.<fn>
  File "schedule_microtask.dart", line 41, in _microtaskLoop
  File "schedule_microtask.dart", line 50, in _startMicrotaskLoop

[devrnt]

This is a client problem. This occurs whenever a client is behind some proxy. Or the connection is refused by their ISP.