| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/google/martian/v3 | Package martian provides an HTTP/1.1 proxy with an API for configurable request and response modifiers. |
| github.com/google/martian/v3/parse | Package parse constructs martian modifiers from JSON messages. |
| github.com/google/martian/v3/verify | Package verify provides support for using martian modifiers for request and response verifications. |
| net/http | Package http provides HTTP client and server implementations. |
| net/url | Package url parses URLs and implements query escaping. |