Release Notes: An option was added to disable the 'stale' connection check, which may lead to a slight performance improvement at the cost of reduced reliability. Debug logging in the multi-threaded connection manager was improved. URI.normalize() no longer has an effect on relative URIs. The use of sun.* classes in URI.java was removed, the query param encoding was changed to UTF-8, and multiple transfer encoding headers and non-chunked transfer encodings are now handled correctly.
Release Notes: Bugfixes and new features.