HTTP 426 Upgrade Required

Status code 426 · Class 4xx

HTTP

Upgrade Required

HTTP request chain from browser through CDN and proxy to the origin server
HTTP errors: find which hop in the request chain failed and read its logs.

What it means

HTTP_426 is a HTTP error code reported by web servers and HTTP clients. Its official message is: “Upgrade Required”

How to fix HTTP 426 Upgrade Required

  1. Check the exact method, headers and payload your client is sending with 'curl -v' for comparison

Related errors

HTTP 429 Too Many RequestsHTTP 422 Unprocessable ContentHTTP 431 Request Header Fields Too LargeHTTP 409 ConflictHTTP 410 GoneHTTP 413 Content Too LargeHTTP 500 Internal Server ErrorHTTP 501 Not Implemented

Source: IANA HTTP Status Code Registry

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