todo

gcc的组建

-- DNS cache purging.

-- Implement ContentHandler chaining (non-JDK feature)

-- Implement MIME type by file determination chaining using external
   disk files. (non-JDK feature)

-- Implement determining MIME type from an InputStream

-- Datagram peek()'s

-- Finalize methods for sockets

-- HTTP - caching (supported by JDK?)

-- HTTP - all protocol support beyond basic GET functionality

-- Fix call to Date(String) in URLConnection.getHeaderFieldDate() when
   I figure out why DateFormat isn't working.

-- Finish off all JDK 1.2 permissions stuff

-- Write URLClassLoader