I've recently discovered a tool from Mozilla that generates a best-practices report for implementing HTTP headers.

Link: MDN HTTP Observatory

While I've used Google PageSpeed before, the MDN HTTP Observatory provides detailed guidance on configuring your web server to serve up-to-date HTTP headers.

After using this tool, I made several improvements to my site. Since my site runs on Cloudflare, I had to set up 'Header Response' rules in Cloudflare. After implementing these changes, my score improved to a 'B' with a score of 75/100 significantly better than before.

I came across this tool while exploring the excellent National Grid: Live site by Kate and reading her post on 'Free Content'.