http - Strange image request causing servlet doGet method to be called twice? -

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i'm working on java web application running on tomcat. i'm having strange issue occurs every request. seems every request being made twice 1 of requests seems image request. causing doget method called twice same page request. here screenshot of chrome network console's image tab:

enter image description here

as can see, there request under image tab same main request. verified duplicate request received server , happening in both firefox , chrome. please suggest cause of request might be? know i'm missing don't know what. appreciate help. thank you.


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