(a) no evidence of better performance. Lua/Nginx is very fast too. (b) Its just a proxy, while Lua/Nginx/openresty is much more of a full web development environment. You can use it as a proxy, but it is not the main use case. (c) I don't think Traffic Server has more capabilities, as far as I can see, I think it has fewer as it is much more focus on being a proxy product, while Nginx is a full web server.

I think Lua/nginx and ATS are quite different beasts, solving different problems. Nice presentation on ATS - "Apache Traffic Server: More Than Just a Proxy" https://www.usenix.org/conference/lisa11/apache-traffic-serv...

That sounds interesting. Want to post your writeup of your experience with it?

> has way better performance

Do you have any performance comparison?

> many more capabilities

As...? Care to compare?

How about honoring the RFC's as a first comparison as to capabilities. Example: nginx doesn't even honor Vary headers:

http://trac.nginx.org/nginx/ticket/118