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This article introduces the relevant knowledge of "what is the operation mechanism of the cache server". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

When the user accesses the server, the server needs to sort out the user's request and application and return it to the client. This process often wastes time in the process of requesting feedback. If the user uses the cache server to host, it will greatly speed up the speed of data estoppel.

The HTML cache is stored in a separate cache server, and with memcached, we can easily store the cache in other servers through TCP, and memcached also uses memory space to store cached data, reducing unnecessary disk I go O. On the other hand, memcached maintains an expiration time for each key in the storage, and once this expiration time is reached, the memcached will automatically delete the key, which makes it very easy for us to check the expiration. We only need to specify the expiration time when saving the cached data.

What is the principle of cache server?

The application mode of Web cache server is mainly forward proxy and reverse proxy. Forward proxy (Proxy) mode is that the proxy network user accesses the internet, and the client sends the connection request that should be sent directly to the source server on the internet to the proxy server for processing. The purpose of the forward agent is to accelerate the request response time of users when accessing Internet using a browser, and to improve the utilization of WAN lines. The forward agent works as shown in the figure. The forward proxy browser does not need to establish contact with the site, only to access the Web cache. Through the forward proxy, the access speed of subsequent users is greatly improved, so that they no longer need to traverse the Internet, as long as the required information can be obtained from the local Web cache, which avoids the bandwidth problem, and at the same time, the transmission of repeated requests on the network can be greatly reduced, thus reducing network traffic and saving fees.

The reverse proxy (Reverse Proxy) mode is aimed at the acceleration function of the Web server, in which the cache server is placed in front of the web application server. when the user accesses the web application server, it first goes through the cache server and writes the user's request and the content answered by the application server to the cache server, so as to provide a faster response for subsequent users. The application of CDN server is becoming more and more common. With the development of network information, the demand for faster information acquisition is becoming stronger and stronger. Through CDN cache technology to reduce the cost of obtaining information, at the same time, to achieve high-speed transmission and acquisition of information.

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