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HTTP 305 Use Proxy — Deprecated Status Code

Informational3xx redirection

Overview

HTTP 305 Use Proxy is a deprecated status code that instructed clients to access the resource through a specified proxy.

Key Details

  • 305 was defined in RFC 2616 but deprecated due to security concerns
  • Told clients to re-request the resource through the proxy in the Location header
  • Modern browsers do not honor this status code
  • Could be exploited to redirect traffic through malicious proxies
  • Replaced by explicit proxy configuration or PAC files

Common Causes

  • Legacy server configuration from early HTTP/1.1 era
  • Misconfigured server software sending deprecated status codes
  • Documentation or testing referencing historical HTTP codes

Steps

  1. 1If your server returns 305, update the configuration to use a different approach
  2. 2Use a reverse proxy (nginx, HAProxy) that is transparent to the client
  3. 3For client-side proxy requirements, use PAC (Proxy Auto-Config) files
  4. 4Modern proxy requirements should use 407 Proxy Authentication Required
  5. 5Remove any 305 configurations from web server settings

Tags

http305proxydeprecatedredirect

More in 3xx Redirection

http-300-multiple-choicesHTTP 300 Multiple Choices — What It Means & How to Fix It
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http-301-moved-permanentlyHTTP 301 Moved Permanently — What It Means & How to Fix It
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http-302-foundHTTP 302 Found — What It Means & How to Fix It
Warning
http-303-see-otherHTTP 303 See Other — What It Means & How to Fix It
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http-304-not-modifiedHTTP 304 Not Modified — What It Means & How to Fix It
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http-305-use-proxyHTTP 305 Use Proxy — What It Means & How to Fix It
Warning

Frequently Asked Questions

No modern browser acts on a 305 response. It was deprecated due to security risks.