Backend Network Debugging with DevTools, MITM Proxy, and Wireshark

Diagnosing backend performance issues can feel like searching in the dark, especially when you cannot access or easily modify the source code. By analyzing network traffic directly, you can pinpoint latency, serialization overhead, and connection bottlenecks without changing a single line of code. This course teaches you how to perform black-box testing and network analysis to optimize your backend systems. You will transition from guessing why an application is slow to confidently diagnosing issues across HTTP, HTTPS, and lower-level TCP protocols using industry-standard tools. What you'll learn: - Understand the core principles of network-level backend performance, including latency, connection handshakes, and serialization. - Analyze web application traffic and API latency using browser-based DevTools. - Intercept and inspect encrypted HTTPS traffic from non-browser applications using MITM Proxy. - Capture and decode low-level network packets using tcpdump and Wireshark to diagnose TCP and non-HTTP protocol issues. - Identify common performance bottlenecks such as connection pooling failures, slow database queries, and TLS handshake delays. - Explore modern protocol considerations, including HTTP/2, HTTP/3, and modern secure transport layers. The course starts with foundational networking concepts and terminology, ensuring you understand how data travels before moving into practical analysis. You will progress through written explanations, step-by-step configuration guides, and practical debugging scenarios, starting with browser tools and moving to advanced packet analysis. This course is designed for software developers, backend engineers, and system administrators who want to improve their system diagnostics skills. No prior experience with network analysis tools is required, as we build your knowledge from the ground up. Start reading today to unlock deeper visibility into your backend performance.