gevent runner

Procfile

@@ -1 +1 @@
-web: gunicorn httpbin:app -b "0.0.0.0:$PORT" -w 3
+web: python run_httpbin.py $PORT

requirements.txt

@@ -7,4 +7,4 @@ distribute==0.6.15
 wsgiref==0.1.2
 decorator==3.3.1
 omnijson==0.1.2
-gunicorn
+gevent

run_httpbin.py

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+
+import sys
+
+from gevent.wsgi import WSGIServer
+from httpbin import app
+
+
+try:
+    port = int(sys.argv[1])
+except (KeyError, ValueError):
+    port = 5000
+
+print 'Starting httpbin on port {0}'.format(port)
+http_server = WSGIServer(('', port), app)
+http_server.serve_forever()