NTLM

HtmlUnit is a "GUI-Less browser for Java programs". It models HTML documents and provides an API that allows to invoke pages, fill out forms, click links, etc. just like in the "normal" browser. It has fairly good JavaScript support, and is able to work even with quite complex AJAX libraries, simulating either Firefox or Internet Explorer depending on the configuration you want to use. It is typically used for testing purposes or to retrieve information from web sites.