Error 1035

This error indicates an invalid URI path in a request rewrite.
Common cause
The value or expression of your rewritten URI path is not valid.
This error also occurs when the destination of the URL rewrite is a path under 
/cdn-cgi/.
Resolution
Make sure that the rewritten URI path is not empty and it starts with a 
/ (slash) character.
For example, the following URI path rewrite expression is not valid:
concat(lower(ip.src.country), http.request.uri.path)
To fix the expression above, add a 
/ prefix:
concat("/", lower(ip.src.country), http.request.uri.path)