nc allow for extra options and parameters to be passed and utilized.
To-Do (need a website/server)
If you are running linux and want extended functionality (like passing custom headers) in web challenges, bash (terminal) commands are your best bet.
cURL is a simple but extensible command-line tool for transferring data using various protocols, and allows users to use HTTP to interact with servers, including POST and GET methods.
curl at work, you can simply run
curl 126.96.36.199 (Google), and the html of Google's home page should appear.
There are many other options and flags that can be passed to
curl, making it an extremely useful tool in CTFs