Add Origin Checking.
Get rid of exc_info as there isn't an exception.
Indicate Py3 vs. Py2 codepath.
Use *args, **kwargs, log.warn
Performing check only on open.
Verify that headers are set, explicitly
Name change to same_origin
s/==/is/
Handle variations of name for origin
Merge pull request #4845 from rgbkrk/origin_host

Add Origin checking for websockets.