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Have you used the ngx_lua module (or OpenResty) with Nginx at all? I'm curious if there was something HAProxy does that can't be done with OpenResty, because that is crazy full-featured. Basically the main reason I haven't played around with HAProxy is just because I haven't ever felt like I was missing anything with OpenResty/Nginx

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HAProxy also has Lua support.

The general answer here, is no, I don't think you can do much in HAProxy that you can't do with OpenResty, but with HAProxy you generally don't have to pay the overhead of Lua (and HAProxy tends to be very well optimized, so the difference can be significant at high throughput of requests / bytes).

One notable thing is that OpenResty, unlike HAProxy, uses LuaJIT, which is dramatically faster.

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