diff -r 81083f8841fe Lib/wsgiref/validate.py
--- a/Lib/wsgiref/validate.py	Fri Mar 22 13:49:53 2013 -0700
+++ b/Lib/wsgiref/validate.py	Sat Mar 23 10:21:46 2013 +0000
@@ -337,7 +337,7 @@
 
     # @@: these need filling out:
     if environ['REQUEST_METHOD'] not in (
-        'GET', 'HEAD', 'POST', 'OPTIONS','PUT','DELETE','TRACE'):
+        'GET', 'HEAD', 'POST', 'OPTIONS', 'PATCH', 'PUT', 'DELETE', 'TRACE'):
         warnings.warn(
             "Unknown REQUEST_METHOD: %r" % environ['REQUEST_METHOD'],
             WSGIWarning)