506 Variant Also Negotiates

What it means

HTTP 506 Variant Also Negotiates indicates a configuration error in transparent content negotiation. A chosen variant of the resource is itself set up to negotiate rather than serve content, so the server cannot settle on a final representation. It points at a server-side mistake, not anything the client did wrong.

When it happens

It happens almost exclusively with misconfigured Apache content negotiation, where a variant file is incorrectly marked as negotiable, creating a loop the server cannot resolve.

How to fix it

• Review the content-negotiation configuration and fix the variant that is wrongly set to negotiate.
• Ensure each negotiable resource points only at concrete, non-negotiating variants.
• Check the server error log for the specific resource that triggered the loop.

SEO impact

Negative if it affects real pages, but very rare. As a 5xx, it blocks indexing of the affected URL until the misconfiguration is fixed.