bachi76 commented on issue #1644: pagespeed css request times out with 404 while optimizing URL: https://github.com/apache/incubator-pagespeed-mod/issues/1644#issuecomment-398428265 > If a .pagespeed. resource can't be fetched and rewritten in the timeout, a 404 is returned and the web page breaks. We should, for non-combined resources, either redirect to the origin resource, or just serve the origin resource with private/300 TTL. We suffer from this problem with random images that proabably aren't processed in time to webp, thus ending up with 404s. It would be really helpful if mod_pagespeed would in this case just deliver the original resource and so not break the page.
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