At wsgiref.simple_server:99, it uses the wrong field to get the headers from the request.  In rfc822.Message.readheaders it describes that the headers attribute is an uninterrupted list of the lines in the header.  The dict attribute of Message should contain the proper key/value map of the headers.

I've attached a patch of what I think the behavior should be.  This has incidentally been fixed in python 3+.