Xiaolin Talks Programming

Jul 5, 2026 · Backend Development

Spring Boot HTTP Client Tuning: From RestTemplate to HttpClient 5 for Production Connection Pools

This guide details production-grade HTTP client tuning in Spring Boot, covering RestTemplate pitfalls, HttpClient 5 configuration, connection pool sizing via Little's Law, timeout layering, HTTP/2 trade-offs, business isolation patterns, interceptor chains, graceful shutdown, and metrics-driven troubleshooting for connection leaks.