The operation is not implemented or is not supported/enabled in this service
Indicates the server does not support the requested RPC method. This is a permanent error and clients should not retry.
- 1The client is calling an RPC method that does not exist on the server.
- 2The client is using an outdated service definition (protobuf) and calling a method that has been removed.
- 3The server has not implemented the specific method within a service it exposes.
A client calls an experimental new method that has not been deployed to the production servers yet.
// Client tries to call a method that is not defined in the server's service
try {
await client.aNewMethodThatDoesNotExist(request);
} catch (e) {
// e.code will be grpc.status.UNIMPLEMENTED
}expected output
StatusCode.UNIMPLEMENTED: The operation is not implemented or is not supported/enabled in this service
Fix 1
Check Client and Server Proto Definitions
WHEN When a method call fails with this error.
// This is a check of the .proto files, not runtime code.
// Server's .proto file:
service MyService {
// rpc aNewMethodThatDoesNotExist(...) is missing.
}
// Client's .proto file:
service MyService {
rpc aNewMethodThatDoesNotExist(...) {}
}Why this works
Ensure that the client and server are built using the same version of the service's .proto file.
Fix 2
Feature Flag the Method Call
WHEN When deploying a new method that may not be available on all servers.
// Client checks a feature flag before calling the new method
if (featureFlags.isNewMethodEnabled) {
await client.aNewMethodThatDoesNotExist(request);
} else {
useOldMethod(request);
}Why this works
Using feature flags allows clients to gracefully handle cases where they are communicating with older servers that don't have the new method.
✕ Retry the request
The server has explicitly stated it does not know what this method is. Retrying will never succeed.
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