prevent injection if image type is wrong

[pirobox]

Hi,
in my very old app, I have this nasty scenario: an image has a src that is something like http:/give/me/some/image/from/server and the problem is that I don't know beforehand which type of image (svg, png,...) the url will return.
So, is there a way for intercepting the loading of the image and, if it is an svg, I let library do the replacement of the with an , but, if it is another type of image I leave the old tag.

regards