That's what I used to do :P, one of the features that httplab offer, is that you can inspect the request
Or redirect the standard input of netcat to the response file.
nc -lp 80 < response.html
Today I learned something fantastic, thank you! :o)
What's the correct command for BSD nc (on macOS)? For the `-l` option, the manual says "It is an error to use this option in conjunction with the -p, -s, or -z options".