hi, looking over: https://twistedmatrix.com/documents/14.0.2/_downloads/response.py im not really sure why one would use the line: self.remaining = 1024 * 10 this suggest to me that one knew what kind of page size was expected...but what if you dont? wouldnt it make more sense to use someting like this: def dataReceived(self, bytes): self.page_content = self.page_content + bytes this would sum up all the data until connectionLost is called. and in connectionLost(): def connectionLost(self, reason): print 'Finished receiving body:', reason.getErrorMessage() self.finished.callback(self.page_content) and then print it? also i dont get why one would use return finished in cbRequest. where is this finished returned to? its called via: d.addCallback(cbRequest) isnt the result from cbRequest thrown away? i would expect the line to read: new_deferred = d.addCallback(cbRequest) thx for your answers