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This tutorial will introduce sockets in Python and how to use the socket module to build HTTP servers and clients in Python. It will also cover Tornado, a Python networking library that is ideal for long polling, WebSockets, and other networking scena...

The Java Networking API provides a way to find the local host IP address from a Java program using the java.net InetAddress class. It is rare that you need the local host IP address in a Java program. Most of the time, I use the Unix command to find t...

I just had to set up an Apache server for a school project. Since I like to use .htaccess files to set rewrite rules and fiddle with some other options, I had to load some extra modules in addition to the standard batch processing. Using phpin...

A cross-site scripting (XSS) attack is a type of injection where a malicious script is injected into an otherwise benign and trusted website. It occurs when an attacker uses a web application to send malicious code (usually in the form of a browser-si...

Command injection is an attack whose goal is to execute arbitrary commands on the host operating system through a vulnerable application. This happens when an application passes unsecured user-supplied data (forms, cookies, HTTP headers, etc.) to the ...

In this article, we will introduce how to avoid cross-origin (CORS) issues in React/Next.js. Cross-origin resource sharing (CORS) is a protocol that defines how web requests should be handled when crossing different URLs....

What is a REST API? REST or RESTful API design (Representational State Transfer) is an architectural style that uses existing protocols. There are six key constraints for REST API design:...

With Elementor, we can replace the block editor with a more intuitive page builder. If you are an Elementor user, you need to load the editor every time you want to create or edit a page. However, sometimes errors can prevent Elementor from loading....

I recently discovered that error responses from a Node JS microservice were coming with the HTTP error "431 Request Header Fields Too Large", but at first it seemed to be intermittent, depending on the test environment used. Further investigation reve...

We recently installed nginx version 1.17 on a new machine. The configuration created in sites-available` was symlinked to `sites-enabled`, but nginx is not serving any domains....

Actually, let's clarify first: HTTP does not have status code 0 (zero). The problem is that the nginx worker process died while handling the request, so the connection was broken, resulting in an error without any response data....

When using Websockets or configuring a server with nginx, we may encounter the `$connection_upgrade` variable in the nginx configuration. The $connection_upgrade variable is not available by default. However, it is recommended to define and use it in ...

When we use a backend server for our Angular application during development, when trying to request resources from the API, we may encounter some cross-origin (CORS) restrictions that prevent us from accessing data from the API....

When updating nginx to a newer version, we may encounter deprecated configurations. Nginx uses a YAML-like definition format to create configurations. This format has evolved over time by adding, removing, or changing keywords. This article...

If your website won’t load over a secure connection due to an error like ERR_SSL_PROTOCOL_ERROR, then this is the right place to start. In this article, we’ll explain what this type of error means and walk you through how to fix it so y...