human
Solve the following python programming problem given the following code:
def __call__(self, env, start_response) : 
    def fake_resp(status, response_headers, exc_info = None) : 
        for i in self.header_list : 
            response_headers.append (i) 
return start_response (status, response_headers, exc_info) 
return self.app (env, start_response) 

    
    

    Fix the buggy line: return self.app (env, start_response)
assistant
#Here is Python code to fix the buggy line: return self.

return self.app (env, def fake_resp()