Building a payment integration with PayPal requires handling webhooks to receive real-time notifications about transactions, disputes, subscriptions, and other payment events. However, testing webhooks during local development presents a significant challenge: PayPal needs to send HTTP requests to your server, which means your localhost isn’t directly reachable. In this guide, you’ll learn how to set up and test PayPal webhooks locally using Pinggy, a simple tunneling tool that exposes your local server to the internet with just one command.

Scientific research has entered a new era with AI models that can search, analyze, and synthesize research papers at unprecedented speed. Whether you’re conducting a literature review, writing a research paper, or trying to understand complex scientific findings, these AI tools can dramatically accelerate your workflow while maintaining academic rigor. The key differentiator for research-focused AI tools is their deep research mode the ability to autonomously search through academic databases, analyze multiple papers, identify patterns across studies, and synthesize findings with proper citations.

Text-to-speech (TTS) technology has become incredibly powerful, but accessing high-quality voice synthesis usually means paying for expensive APIs or running resource-intensive models on local hardware. What if you could build and host your own TTS application with studio-quality voices, all running for free in the cloud? That’s exactly what we’ll accomplish using Google Colab, Kokoro TTS, and Pinggy. In this guide, we’ll build a complete text-to-speech web application using the Kokoro TTS model - a lightweight yet powerful model that delivers natural-sounding speech across multiple languages and voices.

The internet was designed with a simple, elegant principle: every device should be able to communicate directly with every other device. This “end-to-end principle” formed the foundation of the original internet architecture, enabling innovation and seamless connectivity. However, the explosive growth of internet-connected devices quickly exhausted the limited IPv4 address space, forcing the adoption of Network Address Translation (NAT) as a stopgap solution. While NAT allowed the internet to continue functioning, it fundamentally broke the end-to-end model and introduced a host of complications for modern applications.

When building web applications or debugging HTTP traffic, you’ve likely encountered these two HTTP headers: Content-Length and Transfer-Encoding: chunked. These headers serve a fundamental purpose they tell the client how much data to expect and when the response is complete. Understanding the difference between these two approaches is essential for developers working with APIs, streaming data, or optimizing web performance. The Content-Length header specifies the exact size of the response body in bytes, allowing the client to know precisely how much data to read.

When a client sends an HTTP request directly to a web server, the server can easily identify the client’s IP address from the TCP connection. However, in modern web architectures, requests rarely travel directly from client to server. They typically pass through one or more intermediaries reverse proxies, load balancers, CDNs, or API gateways. Each of these intermediaries establishes a new connection to the next hop, and in the process, the original client’s IP address is lost.

The modern internet, often conceptualized as a seamless web of interconnected nodes, is actually a fragmented archipelago of private networks. The “End-to-End Principle” a founding principle of internet architecture stating that distinct hosts should communicate directly without intermediate interference has been largely suspended by the widespread deployment of Network Address Translation (NAT). While NAT prevented the premature exhaustion of IPv4 addresses, it introduced significant barriers to bidirectional communication required for peer-to-peer applications like VoIP, online gaming, video conferencing, and decentralized file sharing.

Content creation is one of the most time-consuming tasks in digital marketing, development, and blogging. Whether you’re writing technical docs, marketing copy, or regular blog posts, the demand for high-quality content never slows down. AI writing tools have transformed this process, helping creators produce better content in less time. In 2025, AI tools have evolved far beyond simple text generation. Today’s platforms understand context, maintain brand voice, optimize for SEO, generate visuals, and even automate publishing.

Self-hosted VPNs have steadily become a practical option for anyone who wants more control over their network. Instead of depending on commercial VPN providers - with their opaque logging policies and unpredictable performance - running your own setup gives you full ownership of your data and traffic. Whether you’re connecting back to your home network while traveling, accessing personal servers, managing smart devices securely, or just preferring infrastructure you control end-to-end, a self-hosted VPN removes a lot of the guesswork.

On November 18, 2025, at 11:20 UTC, the internet experienced one of its most significant disruptions in recent history. Cloudflare, the infrastructure backbone serving millions of websites and applications, suffered a catastrophic outage that affected an estimated 2.4 billion monthly active users across major platforms. For nearly six hours, users worldwide encountered HTTP 500 errors instead of their favorite services, marking Cloudflare’s worst incident since 2019. The outage wasn’t caused by a cyberattack or malicious activity.