For this specific case an llm may be a good option. You know what you want and could do it yourself but who wants to type it all out? An llm could generate an http client from the socket level on up and it would be straightforward to verify. "Create an http client in $language with basic support for GET and POST requests and outputs the response to STDOUT without any third party libraries. after processing command line arguments the first step should be opening a TCP socket". That should get you pretty far.

Sure, after all, when has vibe coding ever resulted in security issues?