Freshmeat page: http://freshmeat.net/projects/neon/
neon is an HTTP and WebDAV client library with a C interface. neon features a high-level interface for using HTTP and DAV methods, and a low-level interface which allows the programmer to implement new methods quickly and easily.
neon supports persistent connections, basic and digest authentication, proxy servers (including authentication), and basic TLS/SSL (using OpenSSL). The WebDAV interface includes functions to easily retrieve property values, set or delete properties, as well as basic resource manipulation (move, copy etc.).
This project has the following developers:
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