1. DNS 1.1 Introduction to DNS Domain name resolution: (English: Domain Name System, abbreviation: DNS) is a service of the Internet. As a distributed database that maps domain names and IP addresses to each other, it can make people access the Internet more conveniently. DNS uses udp53 and tcp53. Currently,the length limit for each level […]
Tag: main
Skywalking process analysis_1 (main process analysis)
Foreword skywalking As the most commonly used APM monitoring at present, its importance is indescribable. I have also made many customized transformations for the company’s business. Its internal principle design is very clever, especially the custom agentClassLoader class. The loading part is even more worthy of learning from this idea. This series analyzes the internal […]
The vue subpage realizes the triggering of an event on the main page by exposing attributes.
Directory 1 Introduction 2.Code 2-1 subpage 2-2 Main page 1. Preface Requirement: When I define a timer on the sub-page and click to get the verification code, the timer starts counting down. If the timer does not finish, I exit and close the sub-page and enter the sub-page again. The timer will be refreshed at […]
Cross-domain: Use JSONP and WebSocket to achieve cross-domain access
Cross-domain basic knowledge points: Cross-domain knowledge points Four ways for iframe to achieve cross-domain: Four ways for iframe to achieve cross-domain Note: The virtual host used in this article is also configured in the iframe above. Table of Contents JSONP cross domain Introduction to JSONP Cross-domain experiments: WebSocket cross domain Introduction to websockets Cross-domain experiments […]
Database integrity – entity integrity, referential integrity, attribute constraint naming clauses, domains
Article directory Database integrity 1. Entity integrity 1. Define entity integrity 2. Entity integrity check and breach handling 2. Referential integrity 1. Define referential integrity 2. Reference integrity check and default conditions 3. Constraints on attributes 1. Definition of constraints on attributes 2. Inspection of constraints on attributes and handling of breaches 4. Integrity constraint […]
How to use qt to notify the mainwindow interface of changes in the subform?
1. Signals and slots The subform can notify the main form (MainWindow) of interface changes through the signal and slot mechanism. Here is a simple example that demonstrates how to define a signal in a subform and then wire up this signal in the main form to respond when changes occur. // ChildWindow.h #ifndef CHILDWINDOW_H […]
Problems encountered when maintaining domain name cache within the application
In a recent project I participated in, I encountered a series of problems that relied on DNS servers to resolve external business clusters. The remote business cluster provides business services based on the HTTP/HTTPS protocol. The cluster contains multiple business nodes. In the current solution, domain names are configured on the DNS server to point […]
Solve cross-domain issues by setting response headers
Many articles on the Internet tell you that adding these response headers directly to Nginx can solve cross-domain problems. Of course, most cases can be solved, but I believe there are still many cases where cross-domain problems will still be reported even if the configuration is correct. . This is most likely because the server […]
Use Egret to develop the main interface of a magical mobile game
1. Introduction The Demo uses a large number of EUI component skins, which are mainly developed in combination with VS and EUI. two, 1. Create a new project (I am using the EUI project here, the latest version 5.4.1 – I heard there are many problems) 2. Resource management (build your own folders for easy […]
File operations in C language (remainder)
The word count of the last blog has reached the limit, so I will add the content to this article. We still have no introduction to the determination of the end of file reading and the content of the file buffer. Let us start the next study! Table of Contents 1. Determination of the end […]