With code similar to that I posed in Asynchronous HTTP Request, I was occasionally getting empty responses to my requests. When I added urllib2.HTTPErrorProcessor to the inheritance list for MyHandler, the problem went away. My guess is the server was generating a 503 Service Unavailable responses and my client code wasn't handling it. How one was supposed to know to do this from the documentation, I am unsure. I'm guessing that if the server might provide a redirect for your url, you would also want to inherit from urllib2.HTTPRedirectHandler.
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What about calling opener.add_handler using the default urllib2.HTTPxxxHandler() classes?
ReplyDeleteI hadn't thought of using multiple inheritance in my HTTPRedirectHandler class but seems like an interesting idea and would certainly allow you to place all this "handler" logic in one class.