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day21 network programming (Part 2) Course objective: learn the necessary knowledge of network programming development. Today's summary: OSI7 layer modelTCP and UDPSticky bagBlocking and non blockingIO multiplexing 1. OSI layer 7 model The 7-layer OSI model may not be easy to understand, so let's explain it through a case: Suppose you ...

*The relevant vulnerabilities involved in this paper have been submitted to the manufacturer and repaired. This paper is only limited to technical research and discussion. It is strictly prohibited to use it for illegal purposes, otherwise all the consequences will be borne by itself. What this article shares is that in a vulnerability test, ...

1.NIO 1.1 NIO channel client [application] Client implementation steps Open channelSpecify the IP and port numberWrite dataRelease resources Sample code public class NIOClient { public static void main(String[] args) throws IOException { //1. Open the channel SocketChannel socketChannel = SocketChannel.open(); ...

HTTP&HTTPS HTTP: HTTP->TCPHTTPS: http - > SSL / TLS (encryption / decryption) - > TCP 1.HTTP HyperText Transfer Protocol is an application layer protocol for distributed, cooperative and hypermedia information systems. Simply put, it is a method of publishing and receiving HTML pages, which is used to transfer information betwee ...

What is? Reverse proxy The reverse proxy server determines which server provides services. The return proxy server does not provide a server. Just request forwarding. The forward proxy is as follows Reverse proxy is as follows   Nginx The process of implementing reverse proxy First, install two tomcat servers and put them into the ngin ...

WeChat Public Number: Operations and Maintenance Development Story, Author: wanger demand For those who regularly maintain their website, they often have to deal with https certificates. Typically, an https certificate is valid for one year. Once the certificate expires, the company will lose a lot. Last year NetEase mailbox was a typical c ...

overall design The message log is an important basis for the normal operation and abnormal troubleshooting of the monitoring system. The log is divided into two parts. One part is the disk log, which records the specific contents of all messages received and sent. This part of the log is stored on the disk file in the form of text, which is ma ...

preface This paper mainly studies the token acquisition process of spring security oauth2. There are five ways to obtain tokens, of which the authorization mode is the most complex. Therefore, this paper studies the token acquisition based on the authorization mode. Without much nonsense, let's go to the core source code flow chart first! Tok ...

2.5 HTTP method to inform the server of intention In this chapter, we will learn a lot about the methods used in HTTP. First, take a look at the chart methodexplainSupported HTTP versionsGETGet resources1.0,1.1POSTTransport entity principal1.0,1.1PUTtransfer files1.0,1.1HEADGet message header1.0,1.1DELETEDelete file1.0,1.1OPTIONSAsk for suppo ...

Cross domain The principle of cross domain is: the same domain is only when the protocol, domain name and port are the same. Otherwise, it is cross domain. Cross domain means that the browser does not allow the source of the current page to request data from another source Homology Another concept is homology. Homology refers to the sam ...