Posting a zip file from a web form gives a different mime type using
the cherrypy file type versus mimetype.types_map. Although, both are
valid types, they really should be the same to ease comparison.
Example:

    def postfile(self,*args,**params):
        import mimetypes
        myfile=params['myfile']
        print mimetypes.types_map['.zip']
        print myfile.type

result:

application/zip
application/x-zip-compressed

CP 3.1.1, Python 2.5

And, yes, one can add the CP type to mimetypes, but one should not
have to do this: CP should match the standard implementation in
mimetypes out of the box, always.