A service protocol extension handler. Registered with registerExtension.
Must complete to a ServiceExtensionResponse. method is the method name of the service protocol request, and parameters is a map holding the parameters to the service protocol request.
NOTE: all parameter names and values are encoded as strings.
© 2012 the Dart project authors
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https://api.dartlang.org/stable/2.0.0/dart-developer/ServiceExtensionHandler.html