oschaaf commented on issue #1570: PageSpeed could not optimize (Proxy_pass) if response returned 200 URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1570#issuecomment-396163616 In the fully optimized response `Last-Modified` is gone but there is an `Etag` validator. What I'm saying is that as `Last-Modified` will be omitted from optimized responses, the number of requests that actually have `If-Modified-Since` will gradually go down to 0. So I think that while (synthentic) requests with `If-Modified-Since` may not be optimized in your proxy set up, it's not a (persistent) real-world issue, because nobody will end up sending it.
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