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I'm getting behavior I don't quite understand from my Apache reverse proxy.

I have a back end server which returns a 503 using app_offline.htm during certain processes.

When this occurs I receive a traditional Apache 403 error:

You don't have permission to access / on this server.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

If my back end server is unavailable and mod_proxy can't connect I do see my custom error screen, but a generic 503.. I'm guessing that I need to pass that 503 back from mod_proxy to Apache for handling, but I'm not sure how.

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Adding the ProxyErrorOverride On to my virtual hosts does allow me to capture this status code and react appropriately. The problem is this also redirects all of our other status codes.

I'm using a couple small pass throughs to display the contents on the back side if I get a 404 or the like.

ErrorDocument 404 404.html

Contents of 404.html

<html style="height: 100%">
<body style="height: 100%">
    <div style="width:100%; height:100%; background-color:transparent;">
    <iframe src="https://xxxxx.com/PageNotFound.aspx" width="100%" height="100%" frameborder="0" scrolling="no"></iframe>
  </div>
</body>
</html>
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