Resources may be downloaded using HTTP 1.0 (using URLs of the form "http://..."), HTTPS ("https://..."). Local files are also supported ("file://..."). See Planned Features for limitations in the current protocol implementations.

The urdl::istream class provides a way to easily access content using standard C++ I/O facilities.

The urdl::read_stream class allows Urdl functionality to be used with other Boost.Asio features such as sockets and timers.