Images in app_offline file

Is there a way to use an image with an app_offline file? I'd like to keep the app_offline looking like the rest of the website - same header, etc, which includes an image.

I did try finding a way to do this but I can't seem to do so. The for开发者_StackOverflowum posts that I've ran across say it's not possible, since the app_offline forces all requests (even those for images and css) to redirect to the app_offline page, but I'm hoping that someone here will have an answer. Obviously, I can embed the css into the HTML, rather than pointing to the site's .css file, but I'm not sure how to get around the image issue.

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You could try base64 encoding the image, ie.

<img src="data:image/gif;base64,BASE64STRINGHERE" width="80" height="15" />

The reason you need to do it like this is that IIS sees the image as a request and app_offline.htm being present in the root is telling IIS to redirect ALL requests therefore this includes any MIME types from images to music etc