| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| google.golang.org/grpc/grpclog | Package grpclog defines logging for grpc. |
| google.golang.org/grpc/internal/proxyattributes | Package proxyattributes contains functions for getting and setting proxy attributes like the CONNECT address and user info. |
| google.golang.org/grpc/resolver | Package resolver defines APIs for name resolution in gRPC. |
| google.golang.org/grpc/serviceconfig | Package serviceconfig defines types and methods for operating on gRPC service configs. |
| net/http | Package http provides HTTP client and server implementations. |
| net/url | Package url parses URLs and implements query escaping. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |