"cookies vs. sessions" Answer’s

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The concept is storing persistent data across page loads for a web visitor. Cookies store it directly on the client. Sessions use a cookie as a key of sorts, to associate with the data that is stored on the server side.

It is preferred to use sessions because the actual values are hidden from the client, and you control when the data expires and becomes invalid. If it was all based on cookies, a user (or hacker) could manipulate their cookie data and then play requests to your site.

Edit: I don't think there is any advantage to using cookies, other than simplicity. Look at it this way... Does the user have any reason to know their ID#? Typically I would say no, the user has no need for this information. Giving out information should be limited on a need to know basis. What if the user changes his cookie to have a different ID, how will your application respond? It's a security risk.

Before sessions were all the rage, I basically had my own implementation. I stored a unique cookie value on the client, and stored my persistent data in the database along with that cookie value. Then on page requests I matched up those values and had my persistent data without letting the client control what that was.

Wednesday, March 31, 2021
 
Gigamegs
answered 10 Months ago
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The main difference is that when you use cookie[:foo] = 'bar' the user is able to see the value for the cookie, i.e. 'bar'. When you use session[:foo] = 'bar' the value will be encrypted by rails and stored in the _myapp_session cookie.

You would use the cookie[] format when the information you want to store is not bound to the session, e.g. when the users selects the preferred language.

You would use the session[] format when you want to store information that is related to the current session, e.g. the id of the the user.

Friday, September 3, 2021
 
Ramazan Polat
answered 5 Months ago
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