+
+ if (bereq.retries == 0) {
+ # Clean up the X-Varnish-Backend-503 flag that is used internally
+ # to mark broken backend responses that should be retried.
+ unset bereq.http.X-Varnish-Backend-503;
+ } else {
+ if (bereq.http.X-Varnish-Backend-503) {
+ if (bereq.method != "POST" &&
+ std.healthy(bereq.backend) &&
+ bereq.retries <= 4) {
+ # Flush broken backend response flag & try again.
+ unset bereq.http.X-Varnish-Backend-503;
+ } else {
+ return (abandon);
+ }
+ }
+ }