Package dict implements the Dictionary Server Protocol as defined in RFC 2229.

Package html implements an HTML5-compliant tokenizer and parser.

Package idna implements IDNA2008 (Internationalized Domain Names for Applications), defined in RFC 5890, RFC 5891, RFC 5892, RFC 5893 and RFC 5894.

Package ipv4 implements IP-level socket options for the Internet Protocol version 4.

Package ipv6 implements IP-level socket options for the Internet Protocol version 6.

Package netutil provides network utility functions, complementing the more common ones in the net package.

Package proxy provides support for a variety of protocols to proxy network data.

Package publicsuffix provides a public suffix list based on data from http://publicsuffix.org/.

Package spdy implements the SPDY protocol (currently SPDY/3), described in http://www.chromium.org/spdy/spdy-protocol/spdy-protocol-draft3.

Package websocket implements a client and server for the WebSocket protocol as specified in RFC 6455.