Serve Static PNG files with an "image/png" content type, not "image/x-png"

Question

I'm using google app engine with Python and have a couple static .png image files but they are all being served with an "image/x-png" content-type. This is a problem when I use a browser like chrome and try to view these images as the content-type is unrecognized, which forces chrome to download it as binary, rather than displaying the image.

How can I make App Engine serve these with the proper "image/png" mime type?

Answer 1

Assuming you are using Java, this is specified normally in the mime-mapping section in the web.xml file. See eg here or here.

In your case, I'd try

 <mime-mapping>
        <extension>png</extension>
        <mime-type>image/png</mime-type>
 </mime-mapping>

In Python, it seems you should add some handler to your app.yaml with the appropiate mime_type, for example (replace with your own url and static_dir) :

handlers:
- url: /static/*.png
  static_dir: static
  mime_type: image/png