Designing Resilient Web APIs: Preventing and Handling Service Outages

When a web application goes down, users see a frustrating "Service Unavailable" error. Understanding why these failures happen and how to prevent them is crucial for any modern developer. This course teaches you how to design, configure, and maintain highly resilient APIs and web services. You will move from writing fragile code to implementing robust fault-tolerance patterns that keep your applications online under heavy load. What you'll learn: Understand the root causes of HTTP 503 Service Unavailable and related gateway errors; Implement essential resilience patterns including retries, backoff strategies, and circuit breakers; Configure rate limiting and load shedding to protect your servers from traffic spikes; Design robust health checks to help load balancers detect and route around unhealthy instances; Apply modern observability practices using structured logs and metrics to diagnose issues quickly. The course starts with foundational concepts of web architecture and error states before guiding you through step-by-step written explanations of design patterns, configuration examples, and code-based implementation strategies. This course is designed for beginner software engineers, web developers, and system administrators looking to build reliable systems, requiring only basic programming knowledge. Start reading today to build services that stay online when it matters most.