The HttpCore components implement the most fundamental aspects of the HTTP protocol. They are nonetheless sufficient to develop basic client-side and server-side HTTP services with a minimal footprint and no external dependencies. The HttpCore base module contains the public API and the default implementation based on the Java classic (blocking) I/O model. It requires a Java 1.3 compatible runtime and has no dependency on any external libraries. HttpCore NIO extensions contain optional components that leverage the event driven, non-blocking I/O (NIO) model. HttpCore NIO extensions require a Java 5.0 compatible runtime and the HttpCore base module. HttpCore NIO extensions are intended for those usage scenarios where raw throughput is less important than the ability to handle thousands of simultaneous HTTP connections in a resource efficient manner. WWW: http://hc.apache.org/httpcomponents-core/