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This patch makes sense in principle, but some of the details need to
change. The _send_output() method is used by some clients, merely
because it can be used :-(. It's fairly easy to preserve this API for
backwards compatibility.
I am also worried about this new api call getheaderdata(). It
complicates the API. Even if it were necessary, it needs a better name,
because getheaderdata() doesn't sound like a method that changes the
connection state or consumes buffered header data.
I think it would be better to have the new behavior exposed only through
HTTPConnection and not HTTP, since that's a Python 1.5.2 compatibility
API(!). We can make some small changes to xmlrpclib to use the newer
API. It would probably be a good change merely because py3k now uses
the newer API.
I've got a working local change, but it's still a little ugly.