Securing your website

HTTPS certificates and security headers: what the browser checks before trusting your site.

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  1. PEM / X.509Decode PEM certificates, CSRs and public keys: subject, validity, SAN, fingerprints and ASN.1 tree.
  2. CSP and security headersBuild a Content-Security-Policy, review its flaws and export the headers for nginx, Apache, Netlify or Caddy.