how to know user request goes to which server if we have multiple web front end servers we deployed asp.net application in iis 8.5 and users access this application from load balncer from out side the network this is internet based application.
Upload a very small image file to
C:\Program Files\Common Files\Microsoft Shared\web server extensions\15\TEMPLATE\IMAGES
Add the image to the page footer in one of your two WFEs. When you reload the page, you will either see the image, or not. And by that you know which is which since every WFE looks into its own image directory.