Number of ways to send http request to remote address and return response in Java+Springboot

I have some doubts about possible ways of sending a request to a remote address, and then return that response in Springboot using Java language. So far I tried to do that only using CloseableHttpClient and CloseableHttpResponse, making rest post call to the address, and then return a response (yet I've been so far unable to read the response properly, since method EntityUtils.getString() has been throwing exceptions.. https://stackoverflow.com/questions/63220523/extracting-json-from-response-as-responseentityproxycontent-type-application )<br>
Does anyone have maybe some other idea how can that be achieved, are there other possible ways how one can send an HTTP request(with headers and body) and read the response, in these technologies?(or at least in some other technologies if it's not possible in these..).<br>
I would greatly appreciate any kind of help or suggestion.

As far as I know there are two common ways to make API reqests in Spring Boot.

1. RestTemplate
2. WebClient

Most of people todat use commonly RestTemplate. But it is going to be deprecated in coming years. So that I recommend you to use WebClient.

Below WebClient POST REQUEST Example:

 @Autowired
 private WebClient.Builder webClientBuilder;


 Turnover turnover = new Turnover();
                
 Gson resp = webClientBuilder.build()
 .post()
 .uri("url")
 .contentType(MediaType.APPLICATION_JSON)
 .accept(MediaType.APPLICATION_JSON )
 .body(Mono.just(turnover),Turnover.class)
 .retrieve()
 .bodyToMono(Gson.class).block();

Turnover.java

@Getter
@Setter
public class Turnover {

    private String start_date;
    private String end_date;
    private String account;

    public Turnover(){
        setStart_date("01.01.2020");
        setEnd_date("01.06.2020");
        setAccount("20293435454");
    }
}

webClientBuilder Bean. In my case I had PROXY. So that I used proxy url and port.

@Bean
	public WebClient.Builder getWebClientBuilder(){

		HttpClient httpClient = HttpClient.create()
				.tcpConfiguration(tcpClient ->
						tcpClient.proxy(proxy -> proxy.type(ProxyProvider.Proxy.HTTP).host("url").port(portnumber)));
		ReactorClientHttpConnector connector = new ReactorClientHttpConnector(httpClient);
		return WebClient.builder().clientConnector(connector);
	}

pom.xml

<dependency>
	<groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-webflux</artifactId>
</dependency>

And don`t forget to create Bean of WebClient in your Main java class. Above I gave just an example. You need to change arguments based on your requirements.