javascript - Server requesting image every time -

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i´m getting strange behaviour when deployed web app on windows server microsoft iis.

creating image object 

 img = new image() ;   img.src = 'someimg.png' ;  img.addeventlistener('load', incrementimagecount ) ;

i´m doing image preloading via javascript , locally works perfect, when deploy on server browser request image every time it´s draw or redraw. have awful looks while it´s loading. in resources on web inspector see same images, multiple times.

any ideas why may happening?


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