[Web] [Dev Channel] Hub handshake failed with error 'NoSuchMethodError:

[DaveBubenik]

The following messages are logged:

Selecting transport 'HttpTransportType.webSockets'.
(WebSockets transport) Connecting.
The HttpConnection connected successfully.
Sending handshake request.
(WebSockets transport) sending data. String data of length '32'.
Hub handshake failed with error 'NoSuchMethodError: invalid member on null: 'sink'' during start(). Stopping HubConnection.
HubConnection failed to start successfully because of error '{Expected a value of type 'Exception', but got one of type 'JSNoSuchMethodError'.toString}'.
Expected a value of type 'Exception', but got one of type 'JSNoSuchMethodError'

I've tracked this down to an issue with _createConnectUrl in http_connection.dart. The function will generate a string that ends with a "#" if there is no uri.fragment. This can be corrected by doing the following:

return Uri(
      scheme: uri.scheme,
      host: uri.host,
      port: uri.port,
      path: uri.path,
      fragment: uri.fragment.isNotEmpty ? uri.fragment : null,
      queryParameters: <String, dynamic>{
        ...uri.queryParameters,
        ...{'id': connectionToken},
      },
    ).toString();

[jamiewest]

Thank you for the issue and code!