gRPC
12 UNIMPLEMENTED
The operation is not implemented or is not supported/enabled in this service.
When You See This Code
The client called an RPC method that the server does not implement. This often happens when the client uses a newer proto definition than the server supports.
How to Fix
Verify the server version supports the method you're calling. Update the server to implement the missing method, or use an alternative endpoint.
Specification
View RFC / Specification →Cross-Protocol Equivalents
Guides
Choosing the Right HTTP Status Codes for REST APIs
API Design
gRPC Status Codes: A Practical Guide
API Design
Debugging Timeout Errors: 408 and 504
Debugging & Troubleshooting
How to Implement and Handle Rate Limiting (429)
API Design
API Versioning Strategies: URL, Header, and Query Param
API Design
Designing Consistent API Error Responses
API Design
API Keys vs OAuth vs JWT: Choosing the Right Auth Method
Security & Authentication