Reverse proxy pen testing

Dear All,

I am in need of procedure/tests that need to be carried out/considered
during a Penetration testing of Reverse Proxy Server. I had googled a
lot and found out very few tests. But still I feel that i've missed
out a lot. Could someone please provide me with links/docs or
procedures to carry out the same.

Thanks in Advance.

Regards,
Gopinath.U