Merge branch 'patch-58' of https://github.com/jessie-jyy/azure-docs-pr into afd-cipher

Author: halkazwini

articles/frontdoor/front-door-rules-engine.md

@@ -32,6 +32,10 @@ A rule set is a customized rules engine that groups a combination of rules into
 * Add, modify, or remove request/response header to hide sensitive information or capture important information through headers.
 
 * Support server variables to dynamically change the request header, response headers, or URL rewrite paths/query strings. For example, when a new page load or when a form gets posted. Server variable is currently supported in **[rule set actions](front-door-rules-engine-actions.md)** only.
+* Populate or modify a response header based on a request header value (e.g., adding the same FQDN in Access-Control-Allow-Origin as the request Origin header).
+* Rename a response header generated by a cloud provider to a brand-specific one by adding a new response header and deleting the original.
+* Redirect to a destination host using a value captured from an incoming query string key/value pair in format of {http_req_arg_key1}.
+* Leverage URL path segment capture in URL redirect and rewrite, e.g. extract tenantID from your incoming URL path "/abc/<tenantID>/<otherID>/index.html” and insert elsewhere in the URL path by using "{url_path:seg1}" in the destination. 
 
 ## Architecture