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browser seems to be changing a session cookie.. is javascript doing this?

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Last Modified: 2015-07-30
I'm analysing HTTPS traffic between my Chrome browser and a 3rd party site of interest.

I notice that the website is passing back a cookie called "session" (in HTTP header "Set-Cookie"), but the next request from the browser has changed the cookie (its a long string of hex, maybe 100chars?, only the first say 20 chars have changed, but changed they have)... which is not what I expect to happen...

or is this being done by javascipt on the page when it loads?

I looked at the page searching for "cookie" but couldn't see anything.. however the page loads up a lot of other .JS scripts too... do I need to check all these too?

cheers
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