Updated to use “gevent” so can use yield to download books

cps.py

@@ -14,10 +14,15 @@ from cps import web
 from tornado.wsgi import WSGIContainer
 from tornado.httpserver import HTTPServer
 from tornado.ioloop import IOLoop
+from gevent.wsgi import WSGIServer
 
 if __name__ == '__main__':
     if web.ub.DEVELOPMENT:
         web.app.run(host="0.0.0.0", port=web.ub.config.config_port, debug=True)
+    else:
+        if len(sys.argv) > 1 and sys.argv[1] == '-g':
+            http_server = WSGIServer(('', web.ub.config.config_port), web.app)
+            http_server.serve_forever()
         else:
             http_server = HTTPServer(WSGIContainer(web.app))
             http_server.listen(web.ub.config.config_port)