The base URL that requests will be made against.
Source
String get baseURL { if (_application != null) { if (!_application.hasFinishedLaunching) { throw new TestClientException("Application under test is not running. Add `await app.start()` in a setup method."); } return "${_application.server.requiresHTTPS ? "https" : "http"}://localhost:${_application.mainIsolateSink.server.server.port}"; } return "$_scheme://$_host:$_port"; }