How does Facebook save my browser and recognize it the next time I log in? -

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how facebook save browser when click on save browser i.e use user-agent combination of mac id? how facebook it?

http header has info regarding browser , agent accessing app with.

check image -> https://cdn.tutsplus.com/net/uploads/legacy/511_http/firebug.png

i assume, take out header information respect unique user id , save browser info signed in user id.


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