shutdown() and half-closes are not "archaic" features. You need them to get even the basic stuff right (see https://blog.netherlabs.nl/articles/2009/01/18/the-

shutdown() and half-closes are not "archaic" features. You need them to get even the basic stuff right (see https://blog.netherlabs.nl/articles/2009/01/18/the-ultimate-so_linger-page-or-why-is-my-tcp-not-reliable https://blog.netherlabs.nl/articles/2009/01/18/the-ultimate-...) and you need it even more to implement "modern" application layer protocols like HTTP2 (if you don't use it, you get data loss bugs like this: https://trac.nginx.org/nginx/ticket/1250#comment:4 https://trac.nginx.org/nginx/ticket/1250#comment:4).