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A URL-related security threat is that it is sometimes possible to construct a URL such that an attempt to perform a harmless idempotent operation such as the retrieval of the object will in fact cause a possibly damaging remote operation to occur . Of course , the distinction between the two dimensions is not sharp , and the properties , content or construction of an object will determine to a large extent how the object is valued in terms of its value , worth and utility . Maybe you've heard of the Heisenberg uncertainty principle , which states that the energy of an object will always be uncertain by a very very small amount divided by the time over which you measure the energy of the object . Next drag the left mouse button on the form and an outline showing the current size of the object will appear . When the Vary header is set , each version of that object will be cached and served to members making future requests as appropriate . The degree of change to the surface of an object will affect removal of soot .