Reading images from URL without knowing the format

I have an image url like this: http://example.com/image.php?id=5605. How do I get the actual image from such an URL? I have tried using ImageIO.read and loading the url directly into an ImageIcon without success.

yeah,
I knew a little about linearization and but the idea was to help quick loading the very first page of a document while the rest of the data still is arriving. Not exactly what I needed here.
Anyway, you have just confirmed my fears, I will have to know the document size, where exactly it ends on my stream, in order to correctly load it.
I appreciate your help sir. Thanks for your time.
Best regards.

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