0:02 (Narrator) Science, the art of learning about the natural world around us. It seems straight-foward, 0:08 you ask a question, you make a hypothesis about what you expect to find, then you perform 0:14 an experiment to see if the hypothesis is correct, you analyze the data, and determine 0:20 if you were right. Simple, right? Well, not really. There is much more to it than that, 0:27 which is what makes science so exciting. And fun! In fact, scientists often describe it 0:34 as a process that is all about exploring, asking questions, testing hypotheses, and 0:41 changing directions if their original ideas were wrong; all the while working and sharing 0:47 with other scientists, advancing what 0:50 we know 0:51 about the world 0:52 around us.

Getting started

Token-based authentication (also known as JSON Web Token authentication) is a new way of handling the authentication of users in applications. It is an alternative to session-based authentication.

If so, establish an authenticated session for the user.

PDU Session types are defined: IPv4, IPv6, IPv4v6, Ethernet, Unstructured.

The reason is Rails only reads and creates the session object when it receives the request and writes it back to session store when request is complete and is about to be returned to user.

Session race conditions are very common in Rails. Redis session store doesn't help either! The reason is Rails only reads and creates the session object when it receives the request and writes it back to session store when request is complete and is about to be returned to user.

As you can see from the example, the session cookie is updated on every request, regardless of if the session was modified or not. Depending on when the response gets back to the client last, thats the cookie that will be used in the next call. For example, if in our previous example, if get_current_result’s response was slower than get_quiz, then our cookie would have the correct data and the next call to update_response would of work fine! So sometimes it will work and sometimes not all depending on the internet gods. This type of race condition is no fun to deal with. The implications of this is that using cookie storage for sessions when you are doing multiple ajax call is just not safe.

A better solution would be to use a server side session store like active record or memcache. Doing so prevents the session data from being reliant on client side cookies. Session data no longer has to be passed between the client and the server which means no more potential race conditions when two ajax are simultaneously made!

the first section i call who do you think you are what a self is and why you really do think you have one no matter how long you've been practicing 00:12:33 second why you really don't have the self you think you have third an exploration of what you are and that's where we'll really talk about personhood

关于Session过期/失效的理解，session与cookie的交互

简单聊一聊Cookie、Session、Token、JWT的区别和作用

COOKIE和SESSION有什么区别？

I wasn’t expecting to facilitate a session

const store = observable({ players: [ "Player 1", "Player 2", ], // ... }) reaction(() => JSON.stringify(store), json => { localStorage.setItem('store',json); }, { delay: 500, }); let json = localStorage.getItem('store'); if(json) { Object.assign(store, JSON.parse(json)); }

The only solution that I can see is to ensure that each user gets their own set of stores for each server-rendered page. We can achieve this with the context API, and expose the stores like so: <script> import { stores } from '@sapper/app'; const { page, preloading, session } = stores(); </script> Calling stores() outside component initialisation would be an error.

One way to do that is to export them from @sapper/app directly, and rely on the fact that we can reset them immediately before server rendering to ensure that session data isn't accidentally leaked between two users accessing the same server.

This is the accepted way to handle problems related to authentication, because user data has a couple of important characteristics: You really don't want to accidentally leak it between two sessions on the same server, and generating the store on a per-request basis makes that very unlikely It's often used in lots of different places in your app, so a global store makes sense.

One of the drawbacks of waiting until someone signs in again to check their password is that a user may simply stay signed in for a long time without signing out. I suppose that could be an argument in favor of limiting the maximum duration of a session or remember-me token, but as far as user experience, I always find it annoying when I was signed in and a website arbitrarily signs me out without telling me why.

I would like to make an appeal to core developers: all design decisions involving involuntary session creation MUST be made with a great caution. In case of a high-load project, avoiding to create a session for non-authenticated users is a vital strategy with a critical influence on application performance. It doesn't really make a big difference, whether you use a database backend, or Redis, or whatever else; eventually, your load would be high enough, and scaling further would not help anymore, so that either network access to the session backend or its “INSERT” performance would become a bottleneck. In my case, it's an application with 20-25 ms response time under a 20000-30000 RPM load. Having to create a session for an each session-less request would be critical enough to decide not to upgrade Django, or to fork and rewrite the corresponding components.

Do Browse like a user wouldTake natural pauses that users would take to consume page contentFocus on the most common use cases, rather than all the possible use casesTake note of pages where forms/logins occur, you will likely need to complete some scripting there

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CompizConfig Settings Manager's Place windows plug-in which will allow an application that isn't running to open on its particular workspace at its pre-defined X-Y coordinate,

Cookie存储在浏览器中，对客户端是可见的，客户端的一些程序可能会窥探、复制以至修正Cookie中的内容。而Session存储在服务器上，对客户端是透明的，不存在敏感信息泄露的风险。

Chapter 1, The Art of Community We begin the book with a bird’s-eye view of how communities function at a social science level. We cover the underlying nuts and bolts of how people form communities, what keeps them involved, and the basis and opportunities behind these interactions. Chapter 2, Planning Your Community Next we carve out and document a blueprint and strategy for your community and its future growth. Part of this strategy includes the target objectives and goals and how the community can be structured to achieve them. PREFACE xix Chapter 3, Communicating Clearly At the heart of community is communication, and great communicators can have a tremendously positive impact. Here we lay down the communications backbone and the best practices associated with using it

Sample Model Case Brief (Should be ONE page (Typed) MAXIMUM!):