RestClient :: Spring Boot 3.2

1.java

// Get data
var response = restClient
        .get()
        .uri("/users/1")
        .retrieve()
        .toEntity(UserResponse.class);

// Error handling
var request = restClient
  .get() 
  .uri("/users/1") 
  .retrieve()
  .onStatus(HttpStatusCode::is4xxClientError, (request, response) -> { 
      throw new UserNotFoundException(response.getStatusCode(), response.getHeaders()) 
  })
  .body(UserResponse.class);

2.java

// Create RestClient
var response = RestClient.create();

// Create RestClient with RestTemplate
var restTemplate = new RestTemplate();            
var response = RestClient.builder(restTemplate);