What causes the error?

  • Incompatible protocol version used by the client

  • Server requires a newer version of the protocol for enhanced security features

  • Client's request is made through a deprecated protocol that the server no longer supports

  • Server configuration mandates a specific protocol for accessing certain resources

# Request example 
curl -X GET https://sandbox.oxylabs.io/ -H 'Accept: */*;q=0.8' -H 'Accept-Encoding: gzip, deflate' -H 'User-Agent: Chrome/91.0.4472.124'

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Methods to try

  • Ensure that the request does not contain any read

  • Verify that the data types and field formats in the request body match the specifications expected by the server.

  • Check for any data constraints like unique constraints or foreign key constraints that the request might be violating.

  • Review the API documentation for specific fields or elements that are required but might be missing or null in your request.

# Response example 
HTTP/1.1 426 Upgrade Required
Content-Type: text/html; charset=UTF-8
Content-Length: 68


426 Upgrade Required

Upgrade Required.

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Useful resources

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