We're hosting a couple of HTML5 games that utilise the offline.appcache feature letting games cache a lot better.
To serve the .appcache type however, I had to add the mime type to the server (IIS7) so it wouldn't 404. When I do, it refuses to serve any images or CSS files! The error sent to the browser when I request a CSS or image file is:
The page cannot be displayed because an internal server error has occurred.
The extension I am adding is appcache with the MIME type text/cache-manifest.
Any ideas why it's causing this behaviour?
Finally figured it out, I added the mime type on server level not site level. One of the sites already had that mime type defined. Which caused a conflict. But bizarrely the site with the dual definition was fine, it was the other sites that failed.