Build http server from scratch: https://medium.com/from-the-scratch/http-server-what-do-you-need-to-know-to-build-a-simple-http-server-from-scratch-d1ef8945e4fa

https://dev-notes.eu/2018/06/http-server-in-c/

ico problem: https://www.cisco.com/c/en/us/support/docs/security/web-security-appliance/117995-qna-wsa-00.html