How does backend server handles multiple clients over single TCP connection from load balancer?

I was reading about desync attack and wondered how multiple client requests are handled over a single TCP or TLS connection. When a poisoned request is smuggled by the attacker and forwarded by proxy server to backend server over single stream, how the backend server differentiates between clients. I guess the proxy server just forwards the coming HTTP requests to respective backend servers.

submitted by /u/killMercy321
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from hacking: security in practice https://ift.tt/2FTJh9N