--- a/mercurial/hgweb/common.py	Sun Feb 25 14:07:13 2018 -0500
+++ b/mercurial/hgweb/common.py	Fri Apr 13 16:32:33 2018 -0400
@@ -30,6 +30,8 @@
 HTTP_FORBIDDEN = 403
 HTTP_NOT_FOUND = 404
 HTTP_METHOD_NOT_ALLOWED = 405
+HTTP_NOT_ACCEPTABLE = 406
+HTTP_UNSUPPORTED_MEDIA_TYPE = 415
 HTTP_SERVER_ERROR = 500