Wikipedia
Libwww
libwww ( Library World Wide Web) is a modular client-side web API for Unix and Windows. It is also the name of the reference implementation of the libwww API.
It has been used for applications of varying sizes, including web browsers, editors, Internet bots, and batch tools. Pluggable modules provided with libwww add support for HTTP/1.1 with caching, pipelining, POST, Digest Authentication, and deflate.
The purpose of libwww is to serve as a testbed for protocol experiments so that software developers do not have to "reinvent the wheel".
libcurl is considered to be a modern replacement for libwww.