curl usage to get header

Question

Why does this not work:

curl -X HEAD http://www.google.com

But these both work just fine:

curl -I http://www.google.com

curl -         


        

Answer 1

curl --head https://www.example.net

I was pointed to this by curl itself; when I issued the command with -X HEAD, it printed:

Warning: Setting custom HTTP method to HEAD with -X/--request may not work the 
Warning: way you want. Consider using -I/--head instead.