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  6. HTTP Headers 

3W1 strongly recommends „White Hat SEO” – learn why it's good for your website, while „Black Hat SEO” is not.

15 HTTP Headers from thegioiluat.vnWith a configurable User Agent String, referring URL (referer) and cookies


  1. HTTP/1.1 521
  2. Date: Fri, 13 Jun 2025 15:52:44 GMT
  3. Content-Type: text/plain; charset=UTF-8
  4. Content-Length: 15
  5. Connection: keep-alive
  6. Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=JFMBXxoiP0wLbxyWNSn7C31g3WJzaRqPUDta3JYTfu29XnI21nezczI3JdZWNnkJpfeXs%2FMjCgTukfs3xkYGDbqDnSxMdDR7aD8AngA%2F%2BYH%2B9hxEVXiR1%2ByuqRruC5cpbL20OjQp%2FJvpB5jptg%3D%3D"}],"group":"cf-nel","max_age":604800}
  7. NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
  8. X-Frame-Options: SAMEORIGIN
  9. Referrer-Policy: same-origin
  10. Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
  11. Expires: Thu, 01 Jan 1970 00:00:01 GMT
  12. Server: cloudflare
  13. CF-RAY: 94f2c1bef8e0cee6-FRA
  14. alt-svc: h3=":443"; ma=86400
  15. server-timing: cfL4;desc="?proto=TCP&rtt=1516&min_rtt=1516&rtt_var=758&sent=1&recv=3&lost=0&retrans=0&sent_bytes=0&recv_bytes=161&delivery_rate=0&cwnd=249&unsent_bytes=0&cid=0000000000000000&ts=0&x=0"

Latest HTTP Headers requests list 30 URLs with HTTP status codes


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