class_docstr: An RpcController mediates a single method call.
  
  The primary purpose of the controller is to provide a way to manipulate
  settings specific to the RPC implementation and to find out about RPC-level
  errors. The methods provided by the RpcController interface are intended
  to be a "least common denominator" set of features which we expect all
  implementations to support.  Specific implementations may provide more
  advanced features (e.g. deadline propagation).
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docstr: Returns true if the call failed.
  
  After a call has finished, returns true if the call failed.  The possible
  reasons for failure depend on the RPC implementation.  Failed() must not
  be called before a call has finished.  If Failed() returns true, the
  contents of the response message are undefined.
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code: def Failed(self):
      """Returns true if the call failed.
  
      After a call has finished, returns true if the call failed.  The possible
      reasons for failure depend on the RPC implementation.  Failed() must not
      be called before a call has finished.  If Failed() returns true, the
      contents of the response message are undefined.
      """
      raise NotImplementedError
  
label_desc: Use image node_id 2 for calling the RpcController obj's underlying member method code with example usage: obj.Failed() without return types