Is there a way I can replicate http traffic to a redundant server?
I will be moving a high load prod system over to new hardware over the next few weeks.  However in the mean time I would like to validate that the new hardware will handle the expected loads.  I would really like to stick some kind of 'proxy' infront of the current web server and copy all that http traffic to the new environment, i.e. run them both in parallel.

Ideally this proxy would also validate that the responses are the same.

I can then monitor the new hardware stats (cpu, mem, etc) and see if it looks ok.

What is this kind of proxy called?  Any one have any suggestions?  This is for a Windows .Net (asp.net) and SQL server environment.

Thanks all
Is there a way I can replicate http traffic to a redundant server?
===

I will be moving a high load prod system over to new hardware over the next few weeks.  However in the mean time I would like to validate that the new hardware will handle the expected loads.  I would really like to stick some kind of 'proxy' infront of the current web server and copy all that http traffic to the new environment, i.e. run them both in parallel.

Ideally this proxy would also validate that the responses are the same.

I can then monitor the new hardware stats (cpu, mem, etc) and see if it looks ok.

What is this kind of proxy called?  Any one have any suggestions?  This is for a Windows .Net (asp.net) and SQL server environment.

Thanks all