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501
Not Implemented
Server Error
RFC 7231
The server does not support the functionality required to fulfill the request.
Detailed Information
The 501 status code indicates that the server does not support the functionality required to fulfill the request. This is often returned when a client attempts to access a resource that is not supported by the server.
Common Examples
- •API requests with unsupported functionality
- •Web page requests with unsupported functionality
Common Uses
- •API requests with unsupported functionality
- •Web page requests with unsupported functionality
Best Practices
- •Use when the server does not support the functionality required to fulfill the request
- •Include a detailed error message
- •Ensure proper server configuration and feature detection
Additional Resources
Similar Status Codes
500
Internal Server Error
The server has encountered a situation it does not know how to handle.
502
Bad Gateway
The server, while acting as a gateway or proxy, received an invalid response from the upstream server.
503
Service Unavailable
The server is currently unable to handle the request due to a temporary overload or maintenance.