caddy-frontend: serve a stale result up to 1 day if the origin server is down.

software/caddy-frontend/buildout.hash.cfg

@@ -70,7 +70,7 @@ md5sum = 975177dedf677d24e14cede5d13187ce
 
 [template-trafficserver-records-config]
 _update_hash_filename_ = templates/trafficserver/records.config.jinja2
-md5sum = f3f31188de56bb35383335b3219537f4
+md5sum = 56c7e9f5cc92f8c519f48496010e2078
 
 [template-trafficserver-storage-config]
 _update_hash_filename_ = templates/trafficserver/storage.config.jinja2

software/caddy-frontend/templates/trafficserver/records.config.jinja2

@@ -27,6 +27,7 @@ CONFIG proxy.config.http.cache.open_write_fail_action INT 2
 CONFIG proxy.config.body_factory.template_sets_dir STRING  {{ ats_configuration['templates-dir'] }}
 # Support stale-if-error by returning cached content on backend 5xx or unavailability
 CONFIG proxy.config.http.negative_revalidating_enabled INT 1
+CONFIG proxy.config.http.negative_revalidating_lifetime INT 86400
 ##############################################################################
 # Proxy users variables. Docs:
 #    https://docs.trafficserver.apache.org/records.config#proxy-user-variables