This is crazy, Scott Helme's little project to make it easier for him to investigate website security settings has now pushed past 250,000,000 website scans!
(EDIT: Initially, securityheaders.io had a glitch for me. The website URL prompt text box was grayed out … under latest Firefox/Webkit/iOS. Cannot even get a keyboard pullup from touching the textbox. Now it is working, chaulking it up as a web cache “glitch”.)
How well do you usually score? I tried getting an A+ (all the way up from an F), but I can't get past the CSP warning. Maybe I'm going about it the wrong way.
The site also works on qutebrowser (QtWebEngine) in Linux, as well as on the other usual suspects.