| flag | Package flag implements command-line flag parsing. |
| github.com/gorilla/websocket | Package websocket implements the WebSocket protocol defined in RFC 6455. |
| html/template | Package template (html/template) implements data-driven templates for generating HTML output safe against code injection. |
| log | Package log implements a simple logging package. |
| net/http | Package http provides HTTP client and server implementations. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| path/filepath | Package filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| time | Package time provides functionality for measuring and displaying time. |