configitems: register the 'web.cache' config

mercurial/configitems.py

@@ -727,6 +727,9 b" coreconfigitem('web', 'allow_push',"
 coreconfigitem('web', 'allowzip',
     default=None,
 )
+coreconfigitem('web', 'cache',
+    default=True,
+)
 coreconfigitem('web', 'accesslog',
     default='-',
 )

mercurial/hgweb/hgweb_mod.py

@@ -436,7 +436,7 b' class hgweb(object):'
 
             # Don't enable caching if using a CSP nonce because then it wouldn't
             # be a nonce.
-            if rctx.configbool('web', 'cache', True) and not rctx.nonce:
+            if rctx.configbool('web', 'cache') and not rctx.nonce:
                 caching(self, req) # sets ETag header or raises NOT_MODIFIED
             if cmd not in webcommands.__all__:
                 msg = 'no such method: %s' % cmd