Non-blocking HTTP Requests using WebClient

Snippet

Non-blocking HTTP Requests using WebClient

WebClient is the modern, non-blocking alternative to RestTemplate in Spring. It supports reactive programming, allowing your application to handle many concurrent requests without blocking threads, improving scalability.

snippet.java
java
@Service
public class RemoteClient {
    private final WebClient webClient;
 
    public RemoteClient(WebClient.Builder builder) {
        this.webClient = builder.baseUrl("https://api.example.com").build();
    }
 
    public Mono<User> getUser(String id) {
        return webClient.get()
            .uri("/users/{id}", id)
            .retrieve()
            .bodyToMono(User.class)
            .timeout(Duration.ofSeconds(3));
    }
}

spring

Breakdown

Mono<User>

A reactive type representing a single asynchronous result (0 or 1).

bodyToMono(User.class)

Automatically deserializes the JSON response body into a Java object.

timeout(Duration.ofSeconds(3))

Ensures the request fails if it takes longer than the specified duration.

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Non-blocking HTTP Requests using WebClient

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