how to check if a response is in xml format instead of HTML?

Im working with a server which always sends me XML responds. But sometimes when server is lack or something it reports me about it by sending me back a HTML page (it just a html page informing about the error) but i didn't expect that and my XML parser crashed.
Im using DefaultHttpClient() and I do send header like `mHttpRequest.setHeader("Accept", "text/xml");`
So what is the proper way to ensure i got XML (or other specific format) response?
Are you correctly checking the status code of the response? If it's an error that leads to the HTML page, you should not get a 200 OK.

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