HTTP Proxy Headers Explained
Via, X-Forwarded-For, Proxy-Connection, and Proxy-Authorization headers — what they leak and how targets use them.
Via, X-Forwarded-For, Proxy-Connection, and Proxy-Authorization headers — what they leak and how targets use them.
Common headers
- Via: proxy identification
- X-Forwarded-For: client chain
- Proxy-Authorization: credentials
- Proxy-Connection: keep-alive hints
Related: anonymity levels.
Detection impact
Targets fingerprint header order and presence. Elite pools minimize revealing headers.
Client behavior
Libraries differ in which headers they send. Test with your actual HTTP client, not just curl.
Related: curl proxy config.
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