Merge pull request #82 from alphagov/serve-stale-content-dgu

Handle errors and deliver stale content
alphagov · Jun 4, 2024 · 075ecaa · 075ecaa
2 parents 872a997 + 58c5815
commit 075ecaa
Showing 1 changed file with 15 additions and 0 deletions.
diff --git a/modules/datagovuk/datagovuk.vcl.tftpl b/modules/datagovuk/datagovuk.vcl.tftpl
@@ -125,6 +125,21 @@ sub vcl_recv {
 
 sub vcl_fetch {
 #FASTLY fetch
+  %{ if environment == "integration"}
+    if (beresp.status >= 500 && beresp.status < 600) {
+
+      if (stale.exists) {
+        return(deliver_stale);
+      }
+
+      if (req.restarts < 1 && (req.request == "GET" || req.request == "HEAD")) {
+        restart;
+      }
+    }
+
+    set beresp.stale_if_error = 86400s;
+  %{ endif ~}
+
 
   set beresp.http.Fastly-Backend-Name = req.http.Fastly-Backend-Name;