How to make server to return manifest file with text/cache-manifest content type? By default, if I put it to the server and include into <html manifest="cache.manifest"> it is being loaded with type application/x-ms-manifest.
That's one of the reasons why the recommended extension for manifest files is now .appcache - Microsoft is already using .manifest for something else. To configure content types:
mimeMap entry under staticContent in your web.config like <mimeMap fileExtension=".appcache" mimeType="text/cache-manifest" />