Verify the time to first byte of any website.
Get all the HTTP headers that an URL returns for a typical GET request.
Check whether a website is using the Brotli Compression algorithm or not.
Get & verify the meta tags of any website.
Take an IP and try to look for the domain/host associated with it.
Get approximate IP details.
Check whether a website is using the new HTTP/2 protocol or not.
Check if the URL is cached or not by Google.