- update to 4000.2.20
* If the URI contains "user:pass@" part, use it for Basic Authorization
* Add a test harness.
* Don't leak a socket when getHostAddr throws an exception.
* Send cookies in request format, not response format.
* Moved BrowserAction to be a StateT IO, with instances for
Applicative, MonadIO, MonadState.
* Add method to control size of connection pool.
* Consider both host and port when reusing connections.
* Handle response code 304 "not modified" properly.
* Fix digest authentication by fixing md5 output string rep.
* Make the default user agent string follow the package version.
* Document lack of HTTPS support and fail when clients try
to use it instead of silently falling back to HTTP.
* Add helper to set the request type and body.