When a user clicks on a link on a web page and the browser takes the user away
to the next URL, it will send the new URL a Referer: header in the new
request telling it where it came from. That is the referer header. The
Referer: is misspelled but that is how it is supposed to be!
With curl you set the referer header with -e or --referer, like this:
curl --referer http://comes-from.example.com https://www.example.com/