Index: twisted/web2/server.py
===================================================================
--- twisted/web2/server.py	(revision 26969)
+++ twisted/web2/server.py	(working copy)
@@ -26,7 +26,7 @@
 from twisted.web2 import error
 from twisted.web2.dav.util import joinURL
 
-from twisted.web2 import version as web2_version
+from twisted.web2 import __version__ as web2_version
 from twisted import __version__ as twisted_version
 
 VERSION = "Twisted/%s TwistedWeb/%s" % (twisted_version, web2_version)
@@ -332,6 +332,16 @@
             response = http.Response(responsecode.OK)
             response.headers.setHeader('allow', ('GET', 'HEAD', 'OPTIONS', 'TRACE'))
             return response
+
+        elif self.method == "POST":
+            # Allow other methods to tunnel through using POST and a request header.
+            # See http://code.google.com/apis/gdata/docs/2.0/basics.html
+            if self.headers.hasHeader("X-HTTP-Method-Override"):
+                intendedMethod = self.headers.getRawHeaders("X-HTTP-Method-Override")[0];
+                if intendedMethod:
+                    self.originalMethod = self.method
+                    self.method = intendedMethod
+
         # This is where CONNECT would go if we wanted it
         return None