| cmd/go/internal/vcs | |
| cmd/go/internal/vcweb | Package vcweb serves version control repos for testing the go command. |
| cmd/go/internal/web | Package web defines minimal helper routines for accessing HTTP/HTTPS resources without requiring external dependencies on the net package. |
| crypto/tls | Package tls partially implements TLS 1.2, as specified in RFC 5246, and TLS 1.3, as specified in RFC 8446. |
| crypto/x509 | Package x509 implements a subset of the X.509 standard. |
| encoding/pem | Package pem implements the PEM data encoding, which originated in Privacy Enhanced Mail. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| internal/testenv | Package testenv provides information about what functionality is available in different testing environments run by the Go team. |
| io | Package io provides basic interfaces to I/O primitives. |
| log | Package log implements a simple logging package. |
| net/http | Package http provides HTTP client and server implementations. |
| net/http/httptest | Package httptest provides utilities for HTTP testing. |
| net/url | Package url parses URLs and implements query escaping. |
| 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. |
| testing | Package testing provides support for automated testing of Go packages. |