LuTiao Programming

Feb 22, 2026 · Backend Development

Mastering Spring Boot 4 Declarative HTTP Client: A Complete Practical Guide

This article walks through Spring Boot 4's built‑in HTTP Interface, showing how to replace RestTemplate/WebClient with a type‑safe, annotation‑driven RestClient, covering Maven setup, DTO and interface definitions, configuration, error handling, header injection, timeout control, reactive alternatives, design principles, and a side‑by‑side comparison with the legacy approach.