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Ilya Kantor 2019-07-01 12:27:17 +03:00
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6-data-storage/01-cookie/article.md
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Cookies are small strings of data that are stored directly in the browser. They are a part of HTTP protocol, defined by [RFC 6265](https://tools.ietf.org/html/rfc6265) specification.
Most of the time, cookies are set by a web server. Then they are automatically added to every request to the same domain.
Cookies are usually set by a web-server using response `Set-Cookie` HTTP-header. Then the browser automatically adds them to (almost) every request to the same domain using `Cookie` HTTP-header.
One of the most widespread use cases is authentication:
1. Upon sign in, the server uses `Set-Cookie` HTTP-header in the response to set a cookie with "session identifier".
1. Upon sign in, the server uses `Set-Cookie` HTTP-header in the response to set a cookie with a unique "session identifier".
2. Next time when the request is set to the same domain, the browser sends the over the net using `Cookie` HTTP-header.
3. So the server knows who made the request.
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## Reading from document.cookie
```online
Do you have any cookies on this site? Let's see:
Does your browser store any cookies from this site? Let's see:
```
```offline
Assuming you're on a website, it's possible to see the cookies, like this:
Assuming you're on a website, it's possible to see the cookies from it, like this:
```
```js run