| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| errors | Package errors implements functions to manipulate errors. |
| flag | Package flag implements command-line flag parsing. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/coreos/etcd/discovery | Package discovery provides an implementation of the cluster discovery that is used by etcd. |
| github.com/coreos/etcd/etcdserver | Package etcdserver defines how etcd servers interact and store their states. |
| github.com/coreos/etcd/etcdserver/etcdhttp | Package etcdhttp provides etcd client and server implementations. |
| github.com/coreos/etcd/pkg/cors | Package cors handles cross-origin HTTP requests (CORS). |
| github.com/coreos/etcd/pkg/flags | Package flags implements command-line flag parsing. |
| github.com/coreos/etcd/pkg/netutil | Package netutil implements network-related utility functions. |
| github.com/coreos/etcd/pkg/osutil | Package osutil implements operating system-related utility functions. |
| github.com/coreos/etcd/pkg/transport | Package transport implements various HTTP transport utilities based on Go net package. |
| github.com/coreos/etcd/pkg/types | Package types declares various data types and implements type-checking functions. |
| github.com/coreos/etcd/proxy | Package proxy implements etcd proxy node. |
| github.com/coreos/etcd/rafthttp | Package rafthttp implements HTTP transportation layer for etcd/raft pkg. |
| github.com/coreos/etcd/version | Package version implements etcd version parsing and contains latest version information. |
| io/ioutil | Package ioutil implements some I/O utility functions. |
| log | Package log implements a simple logging package. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| net/http | Package http provides HTTP client and server implementations. |
| net/url | Package url parses URLs and implements query escaping. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| path | Package path implements utility routines for manipulating slash-separated paths. |
| reflect | Package reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| time | Package time provides functionality for measuring and displaying time. |