When I am trying to rewrite an expression, in URL Rewriting Policy Configuration, with regex it doesn't work with body but, with header it works perfectly. For example:

• Configuration
  • regex: "\w+"
  • replacement: "changed"
  • header: true
  • body: true

and result is that every header value contains a lot of "changed" words and in body is changed just first word, in my case "https"