gRPC
6 ALREADY_EXISTS
The entity that a client attempted to create already exists. For example, a file or directory that the RPC was supposed to create already exists.
When You See This Code
A create operation failed because a resource with the same unique identifier or name already exists in the system.
How to Fix
Use a different identifier, or switch to an upsert/update operation if overwriting is acceptable. Check for existing resources before creating.
Specification
View RFC / Specification →Cross-Protocol Equivalents
Comparisons
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