def to_s(include_params=true)
    s = []
    s << "JsonRequest:#{self.object_id}"
    s << "  operation:  #{self.operation}"
    s << "  params:     " + MultiJson.dump(self.params) if include_params
    s.join("\n")
  end
def to_s(include_params=true)
    s = []
    s << "JsonRequest:#{self.object_id}"
    s << "  operation:  #{self.operation}"
    s << "  params:     " + MultiJson.dump(self.params) if include_params
    s.join("\n")
  end
Create a new JsonRequest

 @param [String] operation  Name of operation
 @param [Array] params  Array of parameters; must ve valid JSON types
 Stringify, useful for debugging

 @param [Boolean] include_params         whether or not to include params in the output (default: true)

 @return [String]