Despite your various posts, you are still very vague in stating what you want to accomplish.

There are literally hundreds of possible ways to "create a log file". Selecting the correct one(s) highly depends on your specific requirements.

Can you provide a small sample program plus how the output of that program should look like and explain and walk us through your requirements step-by-step.

BREW /very/strong/coffee HTTP/1.1
Host: goodmorning.example.com

418 I'm a teapot