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http

506 Variant Also Negotiates

Accept-Language fr curl

bash

curl  -H "Negotiate: trans" -H "Accept-Language: fr;" http://example.com/index

http

GET /index HTTP/1.1
Host: example.com
User-Agent: curl/8.7.1
Accept: */*
Negotiate: trans
Accept-Language: fr

fr TCN

http

HTTP/1.1 506 Variant Also Negotiates
Date: Mon, 22 Jul 2024 10:00:00 GMT
Server: Apache/2.4.41 (Unix)
Content-Type: text/html; charset=UTF-8
Content-Length: 233
TCN: list
Vary: negotiate,accept-language
Alternates: {"index.html.en" 1 {type text/html} {language en} {length 48}}, {"another-map.html.fr.map" 1 {type text/html} {language fr} {length 45}}}}

<html>
<head>
  <title>506 Variant Also Negotiates</title>
</head>
<body>
  <h1>Variant Also Negotiates</h1>
  <p>A variant for the requested resource is itself a negotiable resource. This indicates a configuration error.</p>
</body>
</html>


RFC 2295 # section-8.1

300 Multiple Choices
RFC 2295
HTTP
Content Negotiation (Apache HTTP Server )
Apache httpd mod_negotiation.c source HTTP_VARIANT_ALSO_VARIES

MDN

MDN 2026722

GitHub