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FF5 does not show images that are 'moved permanently' (http response 301)

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Our web app shows maps from OpenStreetmap. The webapp is secure, that is, is uses HTTPS. Now, IE complains horribly when the web page tries to load via HTTP, because it's mixed content that that is considered baad.

So our webapp serves the images by responding via HTTPS with a 301 (moved permanently) to the real OpenStreetmap URL (with is HTTP). That fools IE to not complain.

Now, Firefox 5 suddenly does not show the map images AT ALL. This has worked beautifully with previous version (and all other browsers).

What's wrong?

Our web app shows maps from OpenStreetmap. The webapp is secure, that is, is uses HTTPS. Now, IE complains horribly when the web page tries to load <img> via HTTP, because it's mixed content that that is considered baad. So our webapp serves the images by responding via HTTPS with a 301 (moved permanently) to the real OpenStreetmap URL (with is HTTP). That fools IE to not complain. Now, Firefox 5 suddenly does not show the map images AT ALL. This has worked beautifully with previous version (and all other browsers). What's wrong?