I was googling haproxy+cache, and came across nuster(https://github.com/jiangwenyuan/nuster).
Seems it’s built on top of haproxy, claims to be fully compatible with haproxy, and very fast according to https://github.com/jiangwenyuan/nuster/wiki/Web-cache-server-performance-benchmark%3A-nuster-vs-nginx-vs-varnish-vs-squid
Has anyone used it? I would love some feedbacks.