production-quality pure-Python WSGI server

 Waitress is meant to be a production-quality pure-Python WSGI server with
 very acceptable performance. It has no dependencies except ones which live
 in the Python standard library. It runs on CPython on Unix and Windows under
 Python 2.6+ and Python 3.2. It is also known to run on PyPy 1.6.0 on UNIX.
 It supports HTTP/1.0 and HTTP/1.1.