What are the differences between an APP server and a Web server?

The APP server is a method that can be called by client applications. It provides business logic for applications through many protocols. The web server sends pages to enable the browser to browse, and handles HTTP requests specifically.  

Network server usually refers to the server of the website, which is a computer program residing on the Internet. It can provide documents to the web client of the browser, and is also a place to store website data and files. The network server can parse the HTTP protocol. When the network server receives an HTTP request, it will return an HTTP response. The web server can respond to static pages or pictures to jump pages

The APP server can automatically manage system functions, such as object distribution, concurrency, load and resource management, provide a fully functional and reliable operating environment for the server Database system manages data, provides a monitored and managed operating environment for data, and provides security and load balancing. For users, they do not need to deal with database concurrency issues, SQL statement analysis and index optimization functions, or system level functions, such as concurrent requests, object creation, intelligence, caching, and component control.  

The PP server is a server component based on different technologies, which cannot call each other and share data. In fact, the APP server also includes the functions of the web server to a certain extent