the nature of web applications

The nature of web applications

In the socket network programming prior to learning is based on:

• Architecture: C / S architecture
• Protocols: TCP / UDP protocol
• Running in the transport layer of the OSI model,

So in a web application is based on:

• Architecture: B / S architecture
• Protocol: Http protocol
• Application layer

When data needs to be transferred in binary form during transmission, conversion is performed before me: send (msg.encode ( 'utf8')) in the form of transmission, but this is not intuitive. For more intuitive, you should use bytes ( 'msg', encoding = 'utf8') and str (msg, encoding = 'utf8')

Then all web applications is essentially a socket server, and the user's browser is a client socket.

web communication principle:

1. The browser sends a HTTP request;
2. Server receives the request, generates an HTML document;
3. HTML documents sent to the server to the browser as the appropriate body HTTP
4. Browser receives corresponding HTTP, HTTP Body removed from the HTML document and display