diff -r e548ab4ce71d Lib/http/__init__.py
--- a/Lib/http/__init__.py	Mon Feb 09 19:49:00 2015 +0000
+++ b/Lib/http/__init__.py	Thu Feb 12 08:33:32 2015 -0800
@@ -107,7 +107,7 @@
     TOO_MANY_REQUESTS = (429, 'Too Many Requests',
         'The user has sent too many requests in '
         'a given amount of time ("rate limiting")')
-    REQUEST_HEADER_FIELD_TOO_LARGE = (431,
+    REQUEST_HEADER_FIELDS_TOO_LARGE = (431,
         'Request Header Field Too Large',
         'The server is unwilling to process the request because its header '
         'fields are too large')