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Where I work, a website/app in the top 20 US alexa rankings, we use Fastly and it is pretty great. If I have a complaint it's that their varnish version is old. The web UI is great, the service is great. I've never had an issue with them in my many years of working with them.

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Yeah they run a fork of varnish 2 with inline C disabled, and a number of custom extensions (surrogate keys, tables/dictionaries, etc.) -- as well as likely customizations to support their massively multi-tenant deployment and more

Add in the necessity of porting vcl for all of their customers, and the prospect of upgrading varnish is obviously pretty daunting.

I suspect they'd rather focus on their new webassembly-based configuration solution, rather than try to keep up with changes in VCL

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