ErrorFindly
5065xx Server ErrorMedium

HTTP 506 Variant Also Negotiates

Defined in RFC 2295

What Does HTTP 506 Mean?

The server has an internal configuration error: the chosen variant resource is configured to engage in content negotiation itself, resulting in circular references.

Common Causes

  1. 1Misconfigured content negotiation creating a loop
  2. 2Variant resource pointing back to itself
  3. 3Broken transparent content negotiation setup

Impact

  • ⚠Cannot access the resource due to server misconfiguration

Developer Fix

For web developers and application engineers

  1. 1Review content negotiation configuration
  2. 2Fix circular references in variant resources
  3. 3Simplify content negotiation logic

Server Admin Fix

For system administrators and DevOps engineers

  1. 1Check server content negotiation configuration
  2. 2Fix variant map files or configuration
  3. 3Test content negotiation paths for loops

Frequently Asked Questions

Is 506 commonly encountered?
Extremely rarely. It indicates a very specific server misconfiguration in transparent content negotiation, which is rarely used in modern web development.
How do I fix a 506 error?
Review your server's content negotiation configuration. A variant resource is configured to negotiate itself, creating a loop. Fix the variant map to break the circular reference.

Related HTTP Status Codes

300Multiple Choices406Not Acceptable

About the Author

Web Infrastructure Team

Verified against official RFC specifications and real-world server configurations. HTTP status code behavior confirmed across Apache, Nginx, and Cloudflare.