HTTP

Tag

Proxy

8 resources tagged Proxy across methods, status codes, headers, cookies, guides, and glossary.

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HTTP Status Codes

521 Web Server Is Down

Cloudflare-specific status code indicating the origin server refused the connection. Learn about this proxy error and how to troubleshoot it.

 HTTP Headers

Forwarded

Learn how the Forwarded header preserves original client information (IP, protocol, host) that would otherwise be lost when requests pass through proxies.

 HTTP Status Codes

HTTP 502 Bad Gateway: Server Communication Error

Learn what 502 Bad Gateway means, why it happens, and how to fix it. Guide covering proxy errors, upstream failures, and troubleshooting.

 HTTP Headers

Proxy-Authenticate Header

Learn how the Proxy-Authenticate header challenges clients for credentials when accessing resources through a proxy. Understand proxy authentication schemes.

 HTTP Headers

Proxy-Authorization Header

Learn how Proxy-Authorization provides credentials to access resources through a proxy server. Understand proxy authentication schemes and security.

 HTTP Headers

Via Header

Learn how the Via header tracks the path of HTTP requests through proxies and gateways. Debug routing issues and understand your network infrastructure.

 HTTP Headers

X-Forwarded-For

Learn how X-Forwarded-For identifies the original client IP when requests pass through proxies or load balancers. Essential for logging and security.

 HTTP Headers

X-Forwarded-Proto

Learn how the X-Forwarded-Proto header identifies the original protocol (HTTP/HTTPS) used by clients connecting through proxies or load balancers.