Redirection kepping referer

Hello
I'm looking for a way to have a referer when I'm using a redirection.
Let me explain.
I have a page on domain1 which send the visitor to the domain2.
I use a header redirection.
But on domain2, I want to know if the visitor is coming by this redirection.
Everytime I checked the referer, it's blank…
Who can tell me how to redirect a visitor and identify it after ?
Thanks a lot

See original post by Bloraud