| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| crypto/rand | Package rand implements a cryptographically secure random number generator. |
| crypto/subtle | Package subtle implements functions that are often useful in cryptographic code but require careful thought to use correctly. |
| encoding/base64 | Package base64 implements base64 encoding as specified by RFC 4648. |
| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/gorilla/securecookie | Package securecookie encodes and decodes authenticated and optionally encrypted cookie values. |
| html/template | Package template (html/template) implements data-driven templates for generating HTML output safe against code injection. |
| net/http | Package http provides HTTP client and server implementations. |
| net/url | Package url parses URLs and implements query escaping. |
| slices | Package slices defines various functions useful with slices of any type. |
| time | Package time provides functionality for measuring and displaying time. |