When an HTML template named MGR_INDEX is installed in the templates/ error page directory this report will return its contents after macro expansion.
This allows creation of a scripted user interface for the cache manager loaded from that template.
Example JS reporting tool
It is worth noting that prettiness of the reporting tool GUI is affected by the report format produced by your Squid. Most existing Squids have rather basic text/plain outputs intended for the cachemgr.CGI tool. It is hoped that future releases will be more flexible.