In engineering, the RS485 control line is often mentioned. What exactly is it? Today, let’s discuss the applications related to RS485. By delving deeper into RS485, you will find that there is indeed a lot of knowledge involved. We will choose some common issues that need to be considered in weak current systems for everyone’s … Read more
Bluetooth is a term we are all too familiar with, from Bluetooth headphones, Bluetooth mice, to Bluetooth speakers… Bluetooth is closely related to our lives. But what exactly is Bluetooth? This story begins with a Danish king Bluetooth is actually a short-range wireless communication technology, an open global standard for wireless transmission of voice and … Read more
Background The HTTP protocol is a stateless protocol, meaning each request is independent of others. Therefore, its initial implementation was to open a TCP socket connection for each HTTP request, which would be closed after the interaction was complete. HTTP is a full-duplex protocol, so establishing and closing connections requires three-way handshakes and four-way handshakes. … Read more
Author: Xiao Tuda, Editor: Emperor Capital Sheep https://wdxtub.com/2017/04/02/http-guide/ The HTTP specification is a standard that we should follow when developing web-related projects. Here, I record the basic knowledge and common usage that I find useful. 0 Introduction to HTTP The HTTP protocol (HyperText Transfer Protocol) is the most widely used network transmission protocol on the … Read more
Who invented the Internet?? Nowadays, whether we are working or living, it seems we can’t live without the Internet! No matter where we go, we always ask for the WIFI password first! Have you ever thought about who invented the Internet?? Tim Berners-Lee (Born in 1955 in the UK) is the inventor of the World … Read more
The HyperText Transfer Protocol (HTTP) is a stateless protocol that operates at the transport layer of the OSI seven-layer model. The HTTP client constructs appropriate HTTP request methods as needed, while the HTTP server responds differently based on various HTTP request methods. 1. HTTP Versions and HTTP Request Methods Throughout the development of HTTP, many … Read more
HTTP is an object-oriented protocol belonging to the application layer. Due to its simplicity and speed, it is suitable for distributed hypermedia information systems. It was proposed in 1990 and has undergone continuous improvement and expansion over the years. Currently, HTTP/1.0 version 6 is in use on the WWW, while the standardization work for HTTP/1.1 … Read more
HTTP (Hypertext Transfer Protocol) is an application layer communication protocol. Introduction to HTTP Protocol Versions: HTTP/0.9: Only accepts the GET request method, does not specify a version number in communication, and does not support request headers. Since this version does not support the POST method, clients cannot send much information to the server. HTTP/1.0: The … Read more
1. Basic Concepts The HTTP protocol stands for Hyper Text Transfer Protocol, which is used to transfer hypertext from World Wide Web (WWW) servers to local browsers. HTTP is a protocol based on TCP/IP for transmitting data (HTML files, image files, query results, etc.). HTTP is an object-oriented protocol belonging to the application layer. Due … Read more
Background Previously, we discussed how to publish messages and their corresponding packets; now let’s look at how the packets for subscribing to a topic are structured. SUBSCRIBE – Subscribe to a Topic The client sends a SUBSCRIBE packet to the server to create one or more subscriptions. Each subscription registers one or more topics of … Read more