| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| crypto/tls | Package tls partially implements TLS 1.2, as specified in RFC 5246, and TLS 1.3, as specified in RFC 8446. |
| go.opentelemetry.io/otel/api/correlation | |
| go.opentelemetry.io/otel/api/global | |
| go.opentelemetry.io/otel/api/kv | |
| go.opentelemetry.io/otel/api/propagation | |
| go.opentelemetry.io/otel/api/trace | |
| google.golang.org/grpc/codes | Package codes defines the canonical error codes used by gRPC. |
| net/http | Package http provides HTTP client and server implementations. |
| net/http/httptrace | Package httptrace provides mechanisms to trace the events within HTTP client requests. |
| net/textproto | Package textproto implements generic support for text-based request/response protocols in the style of HTTP, NNTP, and SMTP. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |