how to get HTTP request details

Question

I want to redirect from www.abc.com to www.xyz.com.
 
When I redirectd to www.xyz.com at that time how I know about detils of GET method of HTTP . so that i come to know this request come from www.abc.com.
 
As both application hosted on different sever. I tried HTTP Handler for www.xyz.com,but I am unable to get details of HTTP when request method is GET .My handler and module event unable to call at time of redierct.
 

thanks in advance