Problem With Self-Hosted Chrome Web App

On installtion I am provoked with this error message

Apps must be served with content type application/x-chrome-extension

My manifest file is as follows

manifest.json

{
  "name": "itsdaniel0",
  "description": "A quick click-through web app",
  "version": "1.0.1",
  "update_url": "http://www.itsdaniel0.com/chrome/app/updates.xml",
  "app": {
    "urls": [
      "*://www.itsdaniel0.com/",
      "*://www.itsdamiel0.com/blog/",
      "开发者_如何学运维*://dl.dropbox.com/"
    ],
    "launch": {
      "web_url": "http://www.itsdaniel0.com/blog/"
    }
  },
  "icons": {
    "128": "logo.png"
  },
  "permissions": [
  ]
}

D/L Link - http://dl.dropbox.com/u/17087195/chrome_extensions/itsdaniel0-app.crx

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you could tell your users to right click on the link ---> Click 'save as'. The file would be downloaded. Then drag file into chrome. Wala!

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Requirements are described in Hosting section, you need to tune your web server accordingly to send required headers.