Where is session data stored

This is over the limit of 3 time s. My rails server exits automatically and now gives the following error: iDos eRecovery Automating Keystrokes with AppleScript: Slowing Down Keystroke Entry with a Loop what do you do before code arrives to your environment getting last successful job run hangfire status window reload in only screen Receiving Function Arguments stuck meaning quickbooks has stopped working when does macbeth send murderers to kill banquo kill SIGUSR2 don't Which one of the following function is used to start a session?

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Improve this answer. Pekka Pekka k gold badges silver badges bronze badges. If cookies are disabled, the session ID is appended to all page requests. Martijn That is not the default behaviour of session. This need some more code stuff to be done in your side — Shakti Singh.

Correct, and if cookies are not available, the session ID is passed through URLs and hidden form inputs. This is handled automatically by PHP. See php. Shakti not necessarily. It just doesn't always work, e. Show 5 more comments. So it is not both then. Just an id that helps us know who a session belongs to doesn't necessarily mean that the session is stored both on the client side and the server side. Therefore it is not both but on the server but a unique ID is stored in the cookie, and the cookie is stored on the client side.

Blockquote "Is session data stored on the server or client browser? Ben Ben 1 1 silver badge 9 9 bronze badges. Nick Weaver Nick Weaver 47k 12 12 gold badges 97 97 silver badges bronze badges. Not both again. Sessions and Cookies are different. We shouldn't say both. An ID stored in the cookie doesn't suddenly make the cookie a session. Sign up or log in Sign up using Google.

Sign up using Facebook. The session can be stored on the server, or on the client. So if there are a million users connected to the server, there will also be a million session ids for those users on the server. So how exactly do users access their session? For a single user application, like a desktop application, there is only one user, so there is also one session, it is not difficult for the application to make the connection between the user and their session data.

However, for a web application, a server has multiple clients, how does it know which session is yours? The general principle is that you, as the client, give the server your session id, and in return the server grants you access to your session data if it finds your session id stored in its session datastore.

The session structure is like a data locker for users, and the key for the locker is the session id, the server is the guy who shows you which one is your locker. When you receive a webpage from the server, along with the page content itself, the server sent you in general, in a cookie the session id that it set to identify your connection among all the requests that it gets.

Make the experiment, open your console and check the cookies, you will see something that looks like :. The session id is usually sent in cookies, but it can also be sent in GET or POST parameters, whatever the technique the session id just needs to be sent to the server.

Before it gives you your drafts page, it checks your session id, looks it up in its session datastore, it finds 5, your session id, so it makes the data in entry 5 available to the code engine php, java, ruby…. In this exchange, you could have just sent your user id in your request, and told the server you want the drafts of this user id. You prefer that the application sends this data only to you. So to protect your data the application makes you log in first to make sure the person asking for the data is really you.

And normally for any request for private data, it should ask you who you are first. So for any request for private data you would have to log in again to make sure the application knows this is really you.

This would be very annoying. To avoid logging in all the time after the first time, sessions keep you logged in while you are connected to the server. Basically, after you logged in the first time, the server remembers in the session that this is really you and lets you ask for more data without asking again who you are.

So if we zoom out from the preceding diagram, we can observe how user connections are identified and maintained by the server thanks to session ids :. Session management is a feature of the server, you need to activate it. Keeping you logged in is one main use of the session, but sessions can also be used to save temporary data that are completely independent of the logged in state.

You could decide to put some data in session just because it is quicker to access. So if you connect from two different browsers, the server will create two session ids.

You should remember that the session id only identifies your connection to the server. All the user identification logic is handled by the application. The bug I was trying to resolve was a session reset. So I thought I would spare you the pain of searching in vain by summing up what you should look for when debugging a session problem. From the preceding sections, you have seen that the logged in state is maintained by the presence of the session id on the server.

To debug this, you need to know your architecture well. In big architectures, there are several servers on the front arranged in clusters and users are load balanced on one of them at each request.

You need to make sure that you share the session data correctly across those servers. The session id is missing from your request, you need to find where it got lost. On the way from the browser to the server, there are several places where the session id could have gotten lost :. Also, be careful to not have http links on a https website with secure cookies. This was my bug. It seems a classic now, but it was not that easy to detect. Because the cookies were secure, the browser never transmitted the cookie over the http connection, because it only allowed cookie transmission over https, hence session reset.

I advise you to look out for : https, secure cookies and redirects, those will be good pointers to the cause of your bug.

Of course you should not rule out this possibility. This one should not be very difficult to find in the code. Usually your session is destroyed only when you close the connection, so when you close your browser. Some servers might have specific directives to reset the session after a timeout before you close the connection, you should check that out. So this is what I wish I could find when I was investigating my bug, here it is now.

Those are the main reasons I can find for session reset, I have tried most of them before finding out about the secure cookies… Go ahead and smile. You can always read about the full story of my bug here : Rings, bells and victory. Posted in Technical , Wiki. Tagged sessions. What does this mean? Can you explain more detail? Thanks again! I meant that if you set your website to accept only secure cookies through your.

My bug was that we had set up the whole website to only transmit cookies over https only secure cookies and a webservice was sending us links to display on the website that were in http, so every time we clicked on those links, the cookies were not transmitted and the session was reset. Hope that clears it for you. Pingback: Perseverance and my new Sinatra web app Jacinda Zhong.

I am gathering knowledge to write my first Python login app and I really like your article. Your programming perspective with diagrams are really helpful. I never knew the interactions between stuffs that cause your bug and I never seen other articles describe this. It is a gem and probably save me and others a lot of troubleshooting time. Many kudos…. Thanks a lot for your comment, it encourages me to use graphics in my posts.

Awesome dude.. Got complete picture of session. Feel like I have to say something expressing my excitement for this article and for your organization of this article. Millions of thanks!!! Pingback: Session Cookies transient cookie Codebazz. Incredible article. Very helpful. Explains everything, each and every detail. Thank you for providing such a nice information.

When twitter redirects to your page you need to associate the id from twitter with the session on your website. The best article I have every read! What a finely organized research! Really really helped me out! I am not a native English speaker and really weak in English. So I must make many grammar and vocabulary mistakes. I really like the style of your blog its content is wonderful as well , especially the images.

I was stimulated to make my blog more useful and beautiful.