MimeCheck is an signed Applet to find out just what MIME types a server is sending for a given URL. MIME types are sometimes known as "content types", e.g. text/plain or application/x-java-jnlp-file. You can also run it standalone as an application with java -jar mimecheck.jar It also tells you what it should be sending. You can invoke it as an applet with an optional URL parameter you want automatically checked. Sorry No Java May be freely used for any purpose but military. Java source code Included. For more information on MIME types see http://mindprod.com/jgloss/mime.html Version 1.1 is faster. It just gets the document headers rather than the whole document to check the mime type. version 1.2 adds an optional URL parameter to make the Applet come up and automatically check a URL. Version 1.3 makes makes it clearer when the Applet is busy checking the server. Version 1.4 handles .jsp .asp and allows invoking purely via URL at http://mindprod.com/urlcheck.html. Verison 1.5 was just some internal tidying. Version 1.6 changed the MIME type for *.class files to match common usage. Added about box. Version 1.7 adds more MS MIME types. Version 1.8 adds a large number of new MIME types.