Alve Elde

Don't send If-Modified-Since if Last-Modified is a weak validator

1

This PR changes backend revalidations to only send If-Modified-Since if the Last-Modified header is at least one second older than the Date header, to prevent revalidating content that changed within...

expire: Force a cache MISS when req.ttl = 0s

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This commit changes the undefined behavior of setting req.ttl = 0s. Setting req.ttl = 0s would previously cause req.ttl to have no effect, but this breaks with setting req.grace =...

varnishtest: Fork and clean up FD table before running tests

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This PR is a follow-up to #3887. It does two things: 1. On systems without the `closefrom` syscall, we now iterate through `/proc//fd/` and individually close each FD. 2. The...