URI (Universal Resource Identifier) usually consists of three parts: ①The naming mechanism for accessing resources; ②The host name where the resource is stored; ③The name of the resource itself, represented by the path. Such as the following URI: http://www.webmonkey.com.cn/html/html40/
Three parts of the URL format: The first part is the protocol (or service method).
The second part is the IP address of the host where the resource is stored (sometimes including the port number
wealthgeneShe\ `\"The third part is the specific address of the host resource, such as directory and file name, etc.
The first part and the second part are separated by the "://" symbol, and the second part and the third part are separated by the "/" symbol. The first and second parts are indispensable, and the third part can sometimes be omitted.
Example: 1.URl example of http protocol: http://www.peopledaily.com.cn/channel/welcome.htm The computer domain name is www.peopledaily.com.cn. The hypertext file (file type: .html) is welcome.htm in the directory /channel. This is a computer from the People's Daily of China.
2. URL in file form
When using URL to represent a file, the server mode is represented by file, followed by the host IP address, file access path (i.e. directory) and file name and other information. Directory and file names can sometimes be omitted, but the "/" symbol cannot be omitted. Example: file://ftp.yoyodyne.com/pub/files/foobar.txt. The above URL represents a file stored in the pub/files/ directory on the host ftp.yoyodyne.com, and the file name is foobar.txt. Example: file://ftp.yoyodyne.com/pub represents the directory /pub on the host ftp.yoyodyne.com. Example: file://ftp.yoyodyne.com/ represents the root directory of the host ftp.yoyodyne.com.

The official account web page update cache, this thing is simple and simple, and it is complicated enough to drink a pot of it. You worked hard to update the official account article, but the user still opened the old version. Who can bear the taste? In this article, let’s take a look at the twists and turns behind this and how to solve this problem gracefully. After reading it, you can easily deal with various caching problems, allowing your users to always experience the freshest content. Let’s talk about the basics first. To put it bluntly, in order to improve access speed, the browser or server stores some static resources (such as pictures, CSS, JS) or page content. Next time you access it, you can directly retrieve it from the cache without having to download it again, and it is naturally fast. But this thing is also a double-edged sword. The new version is online,

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