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Proxy caching service

Squid is the most popular high-performance proxy service software in Linux system, which is usually used as the pre-caching service of Web website, which can replace users to request page data from the website server and cache it. To put it simply, the Squid service program will request the required data such as pages, pictures and so on from the source server of the website according to the received user request, and store the data returned by the server on the server running the Squid service program. When a user requests the same data again, the local data of the storage server can be delivered directly to the user, which not only reduces the waiting time of the user, but also alleviates the load pressure of the website server.

Squid service program has the characteristics of simple configuration, high efficiency and rich functions. It can support data caching of HTTP, FTP, SSL and other protocols. It can perform content filtering and rights management functions based on access control list (ACL) and access rights list (ARL). It can also prohibit users from accessing weixie or inappropriate website resources based on a variety of conditions, so it can protect the security of the enterprise intranet. Improve the network experience of users and help save network bandwidth.

Forward proxy mode refers to allowing users to obtain website pages and other resources through Squid service programs, and restricting users' access to the website based on the access control list (ACL) function. In the specific service mode, it is divided into standard proxy mode and transparent proxy mode.

The standard forward proxy mode is to cache the website data locally to improve the efficiency when the data resources are accessed again, but users must fill in the IP address and port number information of the proxy server in the browser and other software when surfing the Internet, otherwise the proxy service will not be used by default.

Reverse proxy mode refers to allowing multiple node hosts to reverse cache website data, so as to speed up user access. Because generally speaking, websites generally load a large number of static resources such as text and pictures, and they are relatively stable data information. When users initiate requests for access to these static resources in the website page, we can use the reverse proxy pattern provided by the Squid service program to respond. Moreover, if the reverse proxy server happens to have static resources that the user wants to access, send the cached static resources directly to the user, which can not only speed up the user's website visit speed, but also reduce the load pressure on the website server to a certain extent.

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