HTTP Headers

HTTP headers are metadata sent between your browser and web servers. They contain information about your request, including your IP address, browser, and language preferences.

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Understanding HTTP Headers

Forwarded IP Headers

When your request passes through proxies, load balancers, or CDNs, various headers may be added to preserve the original client IP address:

  • X-Forwarded-For: Contains the original client IP and any intermediate proxy IPs
  • X-Real-IP: Often set by reverse proxies to indicate the real client IP
  • Forwarded: Standard HTTP header for proxy information (RFC 7239)
  • CF-Connecting-IP: Cloudflare-specific header containing the original client IP

Other Common Headers

  • User-Agent: Identifies your browser, operating system, and device
  • Accept-Language: Indicates your preferred languages for content
  • Accept: Specifies content types your browser can handle
  • Referer: The URL of the page that linked to the current page