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Spring Boot 4 Microservices & REST APIs · Lesson

WebClient for Reactive Calls

Call other services reactively.

What is WebClient

WebClient is the non-blocking, reactive HTTP client in Spring WebFlux. It replaces the blocking RestTemplate for reactive apps.

  • Returns Mono / Flux responses
  • Fully non-blocking on the Netty event loop

Building a WebClient

Create an instance with a base URL using the builder.

WebClient client = WebClient.builder()
    .baseUrl("https://api.example.com")
    .build();

All lessons in this course

  1. Mono and Flux Basics
  2. Reactive Controllers
  3. WebClient for Reactive Calls
  4. Backpressure and Operators
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