human
Solve the following python programming problem given the following code:
def assertResponseCode(self, method, path, request_body, expected_code, additional_headers = pmap ()) : 
    '
        Issue an HTTP request and make an assertion about the response code.

        :param bytes method: The HTTP method to use in the request.
        :param bytes path: The resource path to use in the request.
        :param dict request_body: A JSON-encodable object to encode (as JSON)
            into the request body.  Or ``None`` for no request body.
        :param int expected_code: The status code expected in the response.
        :param additional_headers: A mapping, additional HTTP headers to send.

        :return: A ``Deferred`` that will fire when the response has been
            received.  It will fire with a failure if the status code is
            not what was expected.  Otherwise it will fire with an
            ``IResponse`` provider representing the response.
        ' 
    if (request_body is None) : 
        headers = { 
            
} 
        body_producer = None 
else : 
        headers = { 
            b'content-type' : [b'application/json'], 
} 
        body_producer = FileBodyProducer (BytesIO (dumps (request_body))) 
headers.update (additional_headers) 
    headers = Headers (headers) 
    requesting = self.agent.request (method, request_body, headers, body_producer) 
    def check_code(response) : 
        self.assertEqual (expected_code, response.code) 
        return response 
requesting.addCallback (check_code) 
    return requesting 

    
    

    Fix the buggy line: requesting = self.agent.request (method, request_body, headers, body_producer)
assistant
#Here is Python program to fix the buggy line: requesting = self.

requesting = self.agent.request (method, path, headers, body_producer)