I am building a media player widget. The thing works for external url's. Now I try to replace the external url with 'http://localhost:8080/file?guid=281513631416323' Alas, this doesn't work. It seems to fail while the file is streamed. Strange is that it works from a separate html+javascript project in Aptana. The player uses a swf file that I can't include as 'dojo.required', but without that file it plays mp3 from external urls.