Strangely no mention of High Performance Browser Networking
https://hpbn.co
I also would mention Distributed systems for fun and profit
http://book.mixu.net/distsys/
while being not exactly about network programming, it is likely a next step for anyone who's building apps that is scattered across several backends/services connected by the network
I also would mention Distributed systems for fun and profit http://book.mixu.net/distsys/ while being not exactly about network programming, it is likely a next step for anyone who's building apps that is scattered across several backends/services connected by the network