There are 2 sites:

```
http://www.site1.com
http://www.site2.com

```

`http://www.site1.com` contains link to `http://www.site2.com` as

```
<a href="http://www.site2.com/">link<a/>

```

When user clicks on link from `http://www.site1.com` browser sends Referer header to `http://www.site2.com`. Based on Referrer header `http://www.site2.com` makes some processes.

I wonder if I can fake/change (maybe with javascript, PHP, ...) Referer header or not send it at all?