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Is there an HTTP caching layer that I could use in front of my website that can be configured to fall back to return the last successful response (200 - 399 status) from the cache, if it encounters a bad response (>=400 status) at the same URL? Similar to Cloudflare's "Always online" feature.

I've been trying to see if Squid or Nginx caches can be configured to do this, but I haven't found anything clear so far.

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  • Varnish has that feature.
    – Gerard H. Pille
    Commented Mar 14, 2018 at 14:16
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    nginx can certainly do that, e.g. with proxy_cache_use_stale.
    – Michael Hampton
    Commented Mar 14, 2018 at 15:02

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