| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/aws/smithy-go/context | |
| github.com/aws/smithy-go/internal/sync/singleflight | |
| github.com/aws/smithy-go/middleware | Package middleware provides transport agnostic middleware for decorating SDK handlers. |
| github.com/aws/smithy-go/transport/http | Package http provides the HTTP transport client and request/response types needed to round trip API operation calls with an service. |
| sync/atomic | Package atomic provides low-level atomic memory primitives useful for implementing synchronization algorithms. |
| time | Package time provides functionality for measuring and displaying time. |