Spring Boot has 3 tools to build and execute HTTP calls:
	
	
	2 Sync type tools (Spring Boot Web):
	RestTemplate 
	    	Weather weather = restTemplate.exchange(url2,  GET, buildRequest(request),
	    		new ParameterizedTypeReference<Weather>() {} ).getBody();
	    		
	    	List<Route> routes = restTemplate.exchange(url,  GET, buildRequest(request),
	    		new ParameterizedTypeReference<List<Route>>() {} ).getBody();
		
	    	
	
	RestClient <- the newer one, and support fluent style coding
	        Weather weather = restClient.get()
			.uri(weatherUrl)
			.retrieve()
			.onStatus(status -> status.value() == 400, (request, response) ->{ return; })
		.body(Weather.class);
		
		List<Route> routes = customClient.get()
			.accept(APPLICATION_JSON)
			.retrieve()
		.body(new ParameterizedTypeReference<List<Route>>() {});
	
	
	1 Async type tools (Spring Boot WebFlux):
	
	WebClient 
	
	
			
	---------------------------------------------------------
	
	I can use RestClient 2 ways: build a custom object that lets me manage the
	request, including customer header to support a correlation id
	
	RestClient customClient = RestClient.builder()
	  .requestFactory(new HttpComponentsClientHttpRequestFactory())
	  .baseUrl(effectUrl)
	  .defaultHeader(CORRELATION_ID_HEADER_NAME, correlationId)
	  .build();

	Weather weather = customClient.get()
	.accept(APPLICATION_JSON)
	.retrieve()
	.body(Weather.class);	
	
	
	or create a default object 
	
	RestClient getClient = RestClient.create();
						
	Weather weather2 = getClient.get()
		.uri(weatherUrl)
		.retrieve()
		.body(Weather.class);