Do you work with gRPC? How do you handle backward compatibility in gRPC?

Backward compatibility in gRPC is achieved through rules for working with protobuf schemas:

• Do not delete or rename existing fields — this will break clients expecting those fields.
• Add new fields with unique numbers — old clients simply ignore unknown fields.
• Do not change the types and numbers of fields — this is critical for compatibility.
• Use optional fields or fields with default values for new data.

Thus, as the API evolves, protobuf messages are extended but do not break old clients. For services, new methods can be added, but old ones should not be removed to maintain compatibility.

In Go, it is common to support multiple versions of proto files and, if necessary, use feature flags or routing based on API version.