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== Implemention Questions ==
* The main problem with existing Listener classes is apparently (according to Boris) that some of them will have already read data from the HTTP body by the time OnStartRequest() is called. (What's the resulting problem here exactly? Has their OnDataAvailable() already been called on the main thread? Do they have some sort of state that would get messed up by the thread retarget?). Boris suggests that we can make some of these--most notably nsUnknownDecoder--safe by converting them from StreamListeners to nsIContentSniffers, so that they are no longer in the listener chain.
* cache: no one seems to know exactly what mods might need to be made to the cache to support multiple simultaneous readers.
