Is ASA 5505 allows to modify the HTTP traffic?

[Miroslav Berkov]

I need make a test of a website without changing the server code. I wish to add cookies to a request header or CORS headers to a server response.

How I can do it with Cisco ASA or another Cisco product like described here or here? 

[Marvin Rhoads]

You cannot do that with an ASA of any model.

[Miroslav Berkov]

may be Cisco WSA can do that?

[Marvin Rhoads]

I'm not as familiar with WSA as I am with the ASA but I'm pretty sure it cannot do this either.

I looked through the latest version of the WSA User Guide and found no reference to such a capability.

The only Cisco product that I know could do something like this would be if you were using an ACE (or even older CSS) as a application delivery controller (aka load balancer). In that case, it can be configured to insert cookies and header values.