NOTE: The present document is work in progress for the September 2018 release. The version number 6.1.0 is provisional and may change. See Changes in Varnish 6.0 for notes about the currently most recent Varnish release.
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Varnish now won't rewrite the content-length header when responding to any HEAD request, making it possible to cache HEAD requests independently from the GET ones (peviously a HEAD request had to be a pass to avoid this rewriting).
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