Axel-Stephane, sorry to take so long to thank you. Your suggestion was close to
correct, and led me to the correct answer, for which I am very grateful.
When I tried to implement your solution, I was not able to implement the
Proxy directive. Some research suggested that I didn't load the
Your problem is not due to mod_rewrite. It is most probably an access control
problem.
I almost managed to reproduce it by adding the following lines to my test
config:
ErrorDocument 403 /docs/FORBIDDEN
Proxy *
Deny from all
/Proxy
What troubles me a little bit is that I do see the rewrite