If you could provide the URL or the request that might be helpful. I know for instance that I have sometimes received that error on https://query.wikidata.org/ when there is a query timeout.
On Tue, Oct 1, 2019 at 4:35 PM Gergő Tisza <[email protected]> wrote: > 503 Backend fetch failed is a generic error message you get when the > application server breaks so badly that it fails to even return an error > message (e.g. PHP fatal errors can do this), so Varnish has to make up its > own error message. > _______________________________________________ > Wikitech-l mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/wikitech-l _______________________________________________ Wikitech-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/wikitech-l
