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In the article Binary Search Trees: Searching and Inserting , we discussed how to insert an element into a binary search tree and how to search for a value in a binary search tree. In this article, we will discuss how to delete a node from...

The in-order descendant of a binary tree is the next node in the in-order traversal of the binary tree. So, for the last node in the tree, it is NULL . Since the in-order traversal of a binary search tree is a sorted array. The node with th...

A binary tree is a non-linear data structure. It is called a binary tree because each node has at most two children. These children are called left and right children. It can also be interpreted as an undirected graph where the topmost node...

In the article "How to use SFTP to interact with a remote server" , we introduced how to connect and interact with a server using SFTP. Now let's take a look at how to perform the main operation - file transfer - after the connection is est...

FTP , or File Transfer Protocol, is a popular, unencrypted method of transferring files between two remote systems. As of 2022, it has been deprecated by most modern software due to its lack of security, and is mostly only used for legacy a...

Similar to the process that Nginx uses to select the Server block that will handle a request  , Nginx also has an established algorithm to decide which Location block within a Server block to use to handle a request. location block syntax...

Nginx is one of the most popular web servers in the world. It can successfully handle high loads with many concurrent client connections and can be used as a web server, mail server, or reverse proxy server. In this article, we will discuss...

Loading websites over the Secure Hypertext Transfer Protocol (HTTPS) is critical to network security. However, if we do not install the Secure Sockets Layer (SSL) certificate correctly, we may encounter many errors such as NET::ERR_CERT_COM...

When browsing the web, the last thing we want to see is an error message. For macOS users, one of the problems you may encounter is the “Safari Can’t Establish a Secure Connection to the Server” error. While this error can seem daunti...

This article shares an SEO problem, soft 404. A status code we often see on websites is 404. Whether we develop a website or not, this is a problem we have to face. What is a soft 404? Before talking about soft 404, we must first understand...

Sometimes even after you have an SSL certificate installed on your website, your website’s users may encounter NET::ERR_CERT_AUTHORITY_INVALID an invalid certificate authority error. Despite the intimidating name, the invalid certificate...

Nothing is more frustrating than receiving an error message that brings our work to a screeching halt—especially when security is involved. Seeing a “This Site Can’t Provide a Secure Connection” notification can be confusing and ala...

In this article, we will continue with the article on how OAuth2.0 issues access tokens and introduce several related knowledge points involving client credentials: Obtain end-user authorization Authorization Response Error Responses and Er...

In the previous article, we introduced that OAuth2.0 is an authorization mechanism whose main purpose is to issue tokens between websites or applications that want to share resources. Before starting this article, we assume that you have un...

When I first came into contact with OAuth2.0, I often confused it with SSO single sign-on. Later, due to work needs, I implemented a set of SSO in the project. Through my gradual understanding of SSO, I also distinguished it from OAuth2.0....