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netcat tricks

“Web server”

while true; do printf 'HTTP/1.1 200 OK\nContent-Length:%i\n\n%si\n' "$(wc -c < index.html)" "$(cat index.html)" | nc -l 8888; done

For static content the following is easier:

nc -l 8888 << EOF
HTTP/1.1 200 OK
Content-Length: 20

<h1>Hello world!</h1>
EOF