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Request Mirroring and Shadow Testing with Caddy

I’ve been using Caddy for a long time, both professionally and for self-hosted hobby stuff (like this website!). It’s a workhorse project that does a lot more than what’s advertised on the website (but the “ultimate server” claim on the site might roll some eyes).

With easy automatic HTTPS, reverse-proxy features, basic load-balancing, and caching functionality, Caddy is seen at or near the edge at a lot of websites. When you consider the flexible routing, JWT validation module and at least two different zero-downtime ways to deploy configuration changes, all of a sudden it starts looking like a quick and lightweight API Gateway too.