What is Spring Boot's WebClient used for? - Multiple Choice Questions

What is Spring Boot’s WebClient used for?

A) To handle HTTP requests and responses in a reactive way

B) To replace RestTemplate with a non-blocking client

C) To perform CRUD operations with MongoDB

D) Both A and B

Answer:

D) Both A and B

Explanation:

Spring Boot’s WebClient is a non-blocking, reactive client that is used to handle HTTP requests and responses in a reactive way. It is the recommended replacement for RestTemplate when building applications that need to perform HTTP requests asynchronously or in a reactive style.

WebClient is part of the Spring WebFlux module and supports both synchronous and asynchronous communication. It provides a flexible and powerful way to interact with RESTful web services, making it ideal for modern, scalable applications:


WebClient client = WebClient.create("https://api.example.com");

Mono<String> response = client.get()
                              .uri("/data")
                              .retrieve()
                              .bodyToMono(String.class);

response.subscribe(System.out::println);

In this example, the WebClient instance sends a GET request to https://api.example.com/data and retrieves the response body as a Mono of type String. The response is processed asynchronously, making the application more responsive and able to handle more concurrent requests.

WebClient’s non-blocking nature makes it a suitable choice for applications that require high throughput and scalability, particularly when building microservices or reactive systems.

Reference links:

Spring Boot Tutorial