HTTP 506 Variant Also Negotiates Error - Meaning & Fix
The HTTP 506 Variant Also Negotiates status code indicates a server error due to misconfiguration. It occurs when the selected resource variant is also set to perform content negotiation, preventing the server from providing a definitive endpoint for the resource. In web scraping, this error can appear when scraping websites that use content negotiation to serve different versions of a page or API response based on factors like language, encoding, or device type.
Main causes
Misconfiguration in the server's content negotiation settings where the selected variant is incorrectly set to perform further negotiations.
Incorrect server setup leading to a loop in variant selection, where a variant points to another negotiable resource instead of a final content.
Errors in the server's .htaccess or similar configuration files that improperly direct negotiation processes to negotiable variants.
Faulty implementation of the content negotiation protocol in the server software, causing it to select negotiable variants as endpoints.
# Request example curl -X GET https://sandbox.oxylabs.io/ -H 'Accept: */*;q=0.8' -H 'Accept-Encoding: gzip, deflate' -H 'User-Agent: Safari/537.36'
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Common fixes
Review the server configuration to ensure that the resource variants are not set to perform content negotiation themselves.
Check and update the content negotiation settings to avoid conflicts between resource variants.
Verify the server's algorithm for selecting resource variants to ensure it does not recursively negotiate.
Simplify the resource variant management to prevent overlap in negotiation roles and responsibilities.
# Response example HTTP/1.1 506 Variant Also Negotiates Content-Type: text/html; charset=UTF-8 Content-Encoding: gzip [Binary gzip-encoded data]
