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HTTP Headers For Troubleshooting

HTTP headers are the notes a server sends with a web response. They can explain redirects, caching, content type, cookies, security policy, and which layer handled the request.

Headers To Notice

  • Location shows where a redirect points.
  • Cache-Control explains browser and CDN caching behavior.
  • Content-Type tells the browser how to interpret the response.
  • Strict-Transport-Security controls HTTPS-only behavior after a browser sees it.

Status Codes Matter

  • 3xx means redirect.
  • 4xx usually means the request was rejected or missing something.
  • 5xx usually means the server or upstream service failed.

Good Test Habit

Check the exact URL users open. A missing slash, www versus apex hostname, or HTTP-to-HTTPS redirect can change the headers you see.