diff -r 16203c6079e7 -r 5890e5872f36 mercurial/configitems.py
--- a/mercurial/configitems.py	Tue Mar 13 08:58:52 2018 -0700
+++ b/mercurial/configitems.py	Tue Mar 13 09:45:56 2018 -0700
@@ -1255,6 +1255,9 @@
 coreconfigitem('web', 'refreshinterval',
     default=20,
 )
+coreconfigitem('web', 'server-header',
+    default=None,
+)
 coreconfigitem('web', 'staticurl',
     default=None,
 )