url - Browser caching the 404 error status responses is not working properly -

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i tried use browser cache 404 errors , have found few weird scenarios. when type in url "testsite.com/testblabla.png", getting 404 response e-tag , when refresh same browser tab not using browser cache if open same url in new tab getting browser cache. weird, firefox not using browser cache 404 status @ all. guys, please let me know if face same issues.


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