Web argument resolver for controller handler method arguments that are annotated with {@link SignedRequest}. Binds JSON payload of the signed_request parameter to the parameter type. JSON properties named with underbar (_) separates will be converted to camel-case when binding to field name. (e.g., "user_id" will bind to a property named "userId"). Any JSON properties without corresponding fields in the target type will be ignored.
@author Craig Walls
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