go runtime_error ai_generated true

rpc error: code = Internal desc = grpc: server failed to encode response: rpc error: code = Internal desc = grpc: error while marshaling: proto: Marshal called with nil

ID: go/grpc-internal-error-server-panic

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-09-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.x active — — —

Root Cause

The server handler returned a nil response message, and the gRPC framework attempted to marshal it, causing a panic or error.

generic

中文

服务器处理程序返回了 nil 响应消息，gRPC 框架尝试编组它，导致 panic 或错误。

Workarounds

  1. 95% success 
    func (s *server) YourMethod(ctx context.Context, req *pb.Request) (*pb.Response, error) {
    // Always return a valid response
    return &pb.Response{}, nil
}
  2. 90% success 
    func validateResponseInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
    resp, err := handler(ctx, req)
    if err != nil { return nil, err }
    if resp == nil { return nil, status.Error(codes.Internal, "nil response") }
    return resp, nil
}

Dead Ends

Common approaches that don't work:

  1. 70% fail

    Recovering from the panic without fixing the nil response still results in an error sent to the client.

  2. 50% fail

    Returning an empty message may be semantically incorrect and does not address the root cause.