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I've noticed that urllib2's HTTPRedirectHandler does not redirect a POST request with the POST data. 
If you send a POST request to a server with data, the data is dropped when the new Request is made to the new url. As stated in a comment in the library itself, redirecting a POST request is not strictly RFC compliant, but it's generally supported anyway. The problem here being that our POST data is not also being redirected. I ran into this issue when writing a web api wrapper in Python.
I'm submitting a small patch that fixes this issue:
--- /usr/lib/python2.7/urllib2.py	2011年10月04日 16:07:28.000000000 -0500
+++ urllib2.py	2012年02月27日 16:03:36.000000000 -0600
@@ -551,7 +551,11 @@
 newheaders = dict((k,v) for k,v in req.headers.items()
 if k.lower() not in ("content-length", "content-type")
 )
+ data = None
+ if req.has_data():
+ data = req.get_data()
 return Request(newurl,
+ data=data,
 headers=newheaders,
 origin_req_host=req.get_origin_req_host(),
 unverifiable=True)