#headers

5 one-liners with this tag.

Check the browser caching headers of a file

$curl -sI https://example.com/wp-includes/css/dist/block-library/style.min.css | grep -iE "^(cache-control|expires|etag|last-modified|age):"

Check the X-Robots-Tag header of a URL

$curl -s -o /dev/null -D - https://example.com/ | grep -i '^x-robots-tag'

harmlessSEO checks

Check whether a website sends the HSTS header

$curl -sI https://example.com/ | grep -i "^strict-transport-security"

harmlessSSL and certificates

Detect the web server and PHP version from HTTP headers

$curl -sI https://example.com/ | grep -iE "^(server|x-powered-by|via):"

Show the HTTP response headers of a website

$curl -sSI https://example.com/

harmlessNetwork