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TLS Handshake

TLS establishes encryption and authenticates the server before HTTP exchange.

Verify in Practice​

openssl s_client -connect api.example.com:443 -servername api.example.com
curl -v https://api.example.com/health

Common Problems​

  • Certificate expired or missing intermediate CA.
  • Hostname mismatch between SNI and SAN/CN.
  • Unsupported protocol or cipher overlap.