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I believe NGINX's caching is as efficient, if not moreso, but it is less flexible. The tools available to you in Varnish's VCL are substantial, plus you get ESI support - something NGINX lacks.

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Also selective cache purging is a paid feature with nginx.

If you're using the filesystem backed cache with nginx, selective cache purge, stats, etc, is a fairly trivial scripting task.

Agreed, There is also an OS alternative which essentially mirrors the functionality of propriety nginx cache purge: https://github.com/FRiCKLE/ngx_cache_purge

Hence you can just build it with your standing nginx binary reducing the need for miscellaneous scripts.

thanks for the info/link!

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