if you have bash or zsh:
otherwise:
enjoy the output on http://localhost:8080
command | cat -u <( echo $'HTTP/1.0 200 OK\nContent-type:text/plain\n\n' ) - | nc -l 8080
otherwise:
echo $'HTTP/1.0 200 OK\nContent-type:text/plain\n\n' > header.txt
command | cat -u header.txt - | nc -l 8088
enjoy the output on http://localhost:8080