Proxied web browser for debugging new DNS records

It's difficult to verify new DNS records. If you check too early, the old records may get cached on your computer, browser, or local network. This tool uses a proxied fetch so you can always view your web page uncached.

Uses @std/fetch on the backend to ensure the DNS records of the request are from new places every request.

Version 4 of this val also showed DNS records, pulled on the server, but I removed that featured, because those records are likely subject to caching. It'd be an improvement to this tool if we could add an uncached DNS check in here. In a couple min I wasn't able to find a free DNS checker API. Pull requests welcome!