In today’s internet era, web services are ubiquitous, and the exchange and retrieval of data have become crucial. Whether it’s fetching remote API data, submitting forms, downloading files, or developing web crawlers, dealing with the HTTP protocol is essential. The Python <span>Requests</span> library serves as an elegant HTTP request library for Python, providing developers with … Read more
Background of the Issue When sending form data using HTTP POST, if the data is sent as a string connected by <span>&</span> (i.e., in <span>application/x-www-form-urlencoded</span> format), there often occurs a garbled text issue when the data contains Chinese characters. This is because Chinese characters are non-ASCII characters and need to be properly encoded to be … Read more
Below is a comparison of the advantages and disadvantages of HTTP and ZMQ in the selection of quantitative trading technologies: Advantages of HTTP High universality and ease of use: As a widely used network protocol, almost all programming languages provide support for HTTP, allowing developers to easily find various libraries and tools in different languages … Read more
Introduction From an enterprise-level project perspective, if you are still using traditional programming-based HTTP clients like HttpClient or OkHttp to directly interface with third-party HTTP APIs, your project is likely filled with a lot of integration logic and code. Each time you need to wrap a call for different integration channels, it can lead to … Read more
1. Version Overview This version builds on the plugin design of v1.1.0, introducing a significant License tiered authorization mechanism and TLS/SSL secure communication support, fully meeting the diverse and multi-level usage needs of enterprises. We always adhere to the design philosophy of “lightweight, high performance, and customizable,” maintaining a small package size (still under 4MB) … Read more
In previous articles, we introduced the following topics in MQTT 5.0:Detailed Explanation of MQTT Packets【01】: CONNECT & CONNACKDetailed Explanation of MQTT Packets【02】: PUBLISH & PUBACKDetailed Explanation of MQTT Packets【03】: SUBSCRIBE & UNSUBSCRIBENow, we will introduce the control packets used to maintain the connection: PINGREQ and PINGRESP. In addition to the control packets for connecting, publishing, … Read more
In the last issue, we introduced the core of MQTT: The core of MQTT communication: Topic This time we will detail QoS, which stands for Quality of Service. (QoS) is a protocol between the message sender and receiver that defines the level of delivery guarantee for specific messages. Below, we will delve deeper into the … Read more
On May 2, AALTO announced that its Zephyr High Altitude Platform System (HAPS) has set a new stratospheric flight record, with one of its aircraft flying continuously for 67 days. The flight was jointly managed by the stratospheric operations center located in Farnborough, Hampshire, UK, and a ground control station in the United States, operating … Read more
Application Overview Hello everyone! Today, I want to talk about the application of the S7-200 PLC combined with the CANopen bus in the new energy vehicle test bench. The development of new energy vehicles is progressing rapidly, and the test bench serves as the “health check center” for these vehicles, capable of detecting various performance … Read more
[Image] We have completed the basic introduction to CAN and CANopen related technologies, and here is a summary: The CAN bus section features a well-made animation, which I would like to share with my friends who are following me 🤭[Image] Source: https://www.parlezvoustech.com/en/bus-can-2024-technolo…