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426

Upgrade Required

Client Error
RFC 2817

The server refuses to perform the request using the current protocol that is being used on the client.

Detailed Information

The 426 status code indicates that the server refuses to perform the request using the current protocol that is being used on the client.

Common Examples

  • API requests with unsupported protocols
  • Web page requests with unsupported protocols

Common Uses

  • API requests with unsupported protocols
  • Web page requests with unsupported protocols

Best Practices

  • Use when the client is using an unsupported protocol
  • Include a detailed error message
  • Ensure proper protocol negotiation and upgrade mechanisms are in place

Quick Actions

Category Information

Client Error

The request contains bad syntax or cannot be fulfilled

Related Status Codes

3 similar
400

Bad Request

The server cannot or will not process the request due to something that is perceived to be a client error.

401

Unauthorized

The request requires user authentication.

402

Payment Required

Reserved for future use.

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HTTP Status Codes Reference - Complete List with Descriptions