*The server that acts as expected: replace the current url with www.googl.com
*The other one: concatenate www.google.com to the current url.
2) hidden redirect
patched the first problem.
Now, I want to do a hidden redirect to google.
I have omitted the [R] attribute and:
*The "good" server does hidden redirect
*The other one doesn't redirect at all (no hidden and shown redirect).