# panic: failed to parse target "localhost:50051": parse error: scheme is missing

- **ID:** `go/grpc-failed-to-parse-address`
- **Domain:** go
- **Category:** config_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

grpc.NewClient requires a scheme prefix (e.g., dns:///, passthrough:///) in newer gRPC versions; bare host:port is rejected.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| google.golang.org/grpc 1.63+ | active | — | — |

## Workarounds

1. **** (95% success)
   ```
   Use a valid scheme:
conn, err := grpc.NewClient("dns:///localhost:50051", grpc.WithTransportCredentials(insecure.NewCredentials()))
// or for a literal address:
conn, err := grpc.NewClient("passthrough:///localhost:50051", ...)
   ```
2. **** (85% success)
   ```
   Register a custom resolver if you need a non-DNS scheme:
resolver.Register(&myResolverBuilder{})
   ```

## Dead Ends

- **** — grpc.Dial is deprecated but still works; however it hides the migration and will be removed. (60% fail)
- **** — gRPC does not understand http://; it expects a gRPC resolver scheme. (85% fail)