The 506 Variant Also Negotiates is an HTTP status code that indicates a server configuration error during content negotiation. A web server has to pick amongst several resource variations after receiving a request.
The HTTP 506 occurs when the server encounters a circular reference during this selection process – essentially, the chosen variant itself is set up to perform further content negotiation, creating an endless loop.
What Causes the 506 Variant Also Negotiate?
The primary causes of a 506 Variant Also Negotiate error stem from server misconfiguration in content negotiation settings. This happens when:
- The server’s content negotiation rules are improperly configured, causing selected variants to trigger additional negotiations instead of delivering content.
- There’s a recursive loop in the server’s configuration where Resource A points to Variant B, which points back to negotiating Resource A.
- The server’s .htaccess file or similar configuration contains faulty directives that create circular references in content negotiation.
- Multiple variants of the same resource are incorrectly set up to negotiate with each other, preventing the server from reaching a final decision.
Example
Request:
GET /document HTTP/2.0
Host: example.com
Accept-Language: en-US, fr;q=0.8
Accept: text/html, application/pdf
Response:
HTTP/2.0 506 Variant Also Negotiates
Content-Type: text/html; charset=UTF-8
Date: Sat, 11 Jan 2025 12:00:00 GMT
Server: Apache/2.4.41
<head>
<h1><title>506 Variant Also Negotiates</title></h1>
<body>
<h2>Variant Also Negotiates</h2>
“The server has an internal configuration error”
</body>
</html>
In this example, when the client requests a document with preferences for language and format. The server encounters a loop where the English HTML version is configured to negotiate further variants, which in turn leads back to the original negotiation process, triggering the 506 status code.
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