Writing your own WebServer in C seems like it must be an endless source of pain.pic.twitter.com/36tBfvVqya
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here it kinda makes sense. this is before the connection is known to be SSL/TLS. the code doesn't implement SSL/TLS; this is just a mitigation against a DDoS attack someone did on the author's server by announcing his server's port 443 as bittorrent peer: https://blog.fefe.de/?ts=b2b8f9f8
basically many boxes connected to his server on port 443 and sent bittorrent garbage, and the TLS library did crypto for the handshake on each incoming connection, causing 100% CPU usage on his (very old) server. this code keeps non-TLS connections from reaching expensive crypto.
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