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Problem :

I have recently started working on the User-Agent based shared-session protection which works between sub domains.

I am working on two sub domains first one is example.com and and second is sub.example.com

I am receiving below USER-AGENT header

“User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko”

I have done research on them from my side and able to intercept the requests to both domains and I found that surprisingly the USER-AGENT HTTP Header which was sent to each domain was different.

Is there anybody who can tell me the reason behind such strange behavior?

8 5 2
3,230 points

1 Answer

1 vote

Solution :

I can help you to clear your doubts related to headers the site in question is I can surely say that it is configured to use the UA-spoofing it is done via the Compatibility View list and that is the main reason behind the IE behavior which makes it to send a custom UA string.

Also I can tell you that the CompatView-based UA spoofing was enabled in the IE8 in the year 2008 And if you want to know for IE10+ then I can surely say that it is gotten richer with the per site spoofing just to enable a best experience.

8 4
5,680 points

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