What cookies are based on

Cookie is based on the HTTP protocol and is implemented by setting some fields in the HTTP header: When the server sends an HTTP response to the client, it can include the "Set-Cookie" field in the response header. Used to store cookies on the client. After the client receives a response with the "Set-Cookie" field, it will save these cookies and send them back to the server through the Cookie field in subsequent requests.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Cookie is based on the HTTP protocol, which is implemented by setting some fields in the HTTP header. When the server sends an HTTP response to the client, it can include the Set-Cookie field in the response header to store cookies on the client. After the client receives a response with the Set-Cookie field, it saves these cookies and sends them back to the server through the Cookie field in subsequent requests.

For example, the server can set a Cookie named "user_id" in the following way:

Set-Cookie: user_id=12345; Expires=Wed, 21 Nov 2023 08:00:00 GMT; Path=/

In this example, the server tells the client to set a Cookie named " user_id" and its value is "12345". Information such as the expiration time and path of the cookie is also specified.

When the client accesses a web page with the same domain name in a subsequent request, a field similar to the following will be added to the request header:

Cookie: user_id=12345

This way , the server can identify the client and use these cookies to implement functions such as session management and personalized experience.

In general, cookies are transmitted and stored by setting the Set-Cookie field in the HTTP header. It is a mechanism based on the HTTP protocol and is used between the client and the server. Pass data and status information.

The above is the detailed content of What cookies are based on. For more information, please follow other related articles on the PHP Chinese website!