The secret of cookie storage location: Do you know it?

With the development of the Internet, we use browsers more and more frequently in our daily lives. When visiting a website, you often need to perform operations such as account login or browsing history. The implementation of these operations is inseparable from the cookie technology in the HTTP protocol. However, many people do not understand where and how cookies are stored. This article will reveal where and how cookies are stored, and provide specific code examples.

1. Cookie storage location

1. Cookie storage location in the client (browser)

On the client, cookies are mainly stored in the browser In the browser, the specific storage location varies from browser to browser. The following is where cookies are stored in common browsers:

Google Chrome:

Windows 7/8/10: C:Users{username}AppDataLocalGoogleChromeUser DataDefaultCookies

macOS :~/Library/Application Support/Google/Chrome/Default/Cookies

Firefox:

Windows 7/8/10: C:Users{username}AppDataRoamingMozillaFirefoxProfiles{random characters} .defaultcookies.sqlite

macOS：~/Library/Application Support/Firefox/Profiles/{random characters}.default/cookies.sqlite

Microsoft Edge browser:

Windows 7/8/10: C:Users{username}AppDataLocalMicrosoftEdgeUser DataDefaultCookies

Apple Safari browser:

macOS:~/Library/Cookies/Cookies.binarycookies

2. Cookie storage location on the server side

On the server side, cookies are generally implemented by setting the Set-Cookie header of the HTTP response message. The specific storage location depends on the server language. There is a difference. The following is the storage location of cookies in commonly used server-side languages:

PHP language:

In PHP, cookies are set through the "setcookie()" function, and the storage location is on the Web server. temporary folder.

Example:

<?php
// 设置 cookie
setcookie("user", "zhangsan");

// 获取 cookie
echo $_COOKIE["user"];
?>

ASP.NET Language:

In ASP.NET, set the cookie by setting the Set-Cookie header in the HTTP response message, and store the location in memory on the Web server.

Example:

Response.Cookies("username").Value = "zhangsan"; // 设置 cookie
string username = Request.Cookies["username"].Value; // 获取 cookie

2. How to store cookies

There are two ways to store cookies: persistent storage and session storage.

1. Persistent storage

The expiration time of persistently stored cookies will not expire until the user closes the browser. Persistently stored cookies can generally have an expiration time set and are stored on the user's computer hard drive. These cookies can be retained even if the user closes the browser.

We can control persistent cookies by setting the cookie expiration time.

How to set the cookie expiration time

In PHP, you can set the cookie expiration time through the third parameter of the setcookie() function, in seconds.

In ASP.NET, you can set the expiration time of cookies through the Response.Cookies("cookieName").Expires property.

2. Session Storage

The expiration time of the cookie stored in the session is that it will expire after the user closes the browser. The cookie stored in the session is stored in the memory of the user's computer. As long as the user closes the browser, the cookie will become invalid and stored in the memory of the client's browser, so it is also called a temporary cookie.

Do not set the expiration time of the cookie, which is a session cookie.

How to set the cookie storage method and expiration time

In PHP and ASP.NET, you can set the cookie storage method and expiration time through parameters. The sample code is as follows:

// How to set cookies in PHP
setcookie($name, $value, time() $expire);

// Set cookies in ASP.NET Method
HttpCookie cookie = new HttpCookie(name, value);
cookie.Expires = DateTime.Now.AddMinutes(expire);

3. Summary

This article is for you This article introduces the storage location and storage method of cookies. Especially in the environment of different browsers and server-side languages, the cookie storage location is very different. At the same time, we also provide specific code examples for setting cookies in PHP and ASP.NET, which we hope will be helpful to you.

The above is the detailed content of The secret of cookie storage location: Do you know it?. For more information, please follow other related articles on the PHP Chinese website!