human
Solve the following python programming problem given the following code:
def _requestAgentTest(self, child, **kwargs) : 
    '
        Set up a resource on a distrib site using L{ResourcePublisher} and
        then retrieve it from a L{ResourceSubscription} via an HTTP client.

        @param child: The resource to publish using distrib.
        @param **kwargs: Extra keyword arguments to pass to L{Agent.request} when
            requesting the resource.

        @return: A L{Deferred} which fires with a tuple consisting of a
            L{twisted.test.proto_helpers.AccumulatingProtocol} containing the
            body of the response and an L{IResponse} with the response itself.
        ' 
    (mainPort, mainAddr) = self._setupDistribServer (d) 
    d = client.Agent (reactor).request ('GET', ('http://%s:%s/child' % (mainAddr.host, mainAddr.port)), ** kwargs) 
    def cbCollectBody(response) : 
        protocol = proto_helpers.AccumulatingProtocol () 
        response.deliverBody (protocol) 
        d = protocol.closedDeferred = defer.Deferred () 
        d.addCallback ((lambda _ : (protocol, response))) 
        return d 
d.addCallback (cbCollectBody) 
    return d 

    
    

    Fix the buggy line: (mainPort, mainAddr) = self._setupDistribServer (d)
assistant
#Here is Python code to fix the buggy line: (mainPort, mainAddr) = self.

(mainPort, mainAddr) = self._setupDistribServer (child)