| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| google.golang.org/grpc | Package grpc implements an RPC system called gRPC. |
| google.golang.org/grpc/balancer | Package balancer defines APIs for load balancing in gRPC. |
| google.golang.org/grpc/codes | Package codes defines the canonical error codes used by gRPC. |
| google.golang.org/grpc/internal/grpcsync | Package grpcsync implements additional synchronization primitives built upon the sync package. |
| google.golang.org/grpc/internal/proto/grpc_lookup_v1 | |
| google.golang.org/grpc/internal/serviceconfig | Package serviceconfig contains utility functions to parse service config. |
| google.golang.org/grpc/internal/testutils | Package testutils contains testing helpers. |
| 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. |
| google.golang.org/grpc/status | Package status implements errors returned by gRPC. |
| google.golang.org/protobuf/encoding/protojson | Package protojson marshals and unmarshals protocol buffer messages as JSON format. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| testing | Package testing provides support for automated testing of Go packages. |