Of course it will work. The whole point of reverse-proxy is to buffer slow requests and send them fast over LAN to your back-end servers that cannot handle high

Of course it will work. The whole point of reverse-proxy is to buffer slow requests and send them fast over LAN to your back-end servers that cannot handle high concurrency efficiently. The FreeBSD's accept_filter() used by Rtm does more or less that (you can think of it as of reverse-proxy in the kernel), but it only works for plain HTTP and HEAD/GET methods.