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На моем Github можно найти маленькие примеры приложений на Spring Framework.

Spring: https://spring.io/ Tutorial: https://kotlinlang.org/docs/jvm-spring-boot-restful.html

Примерная зависимость компонентов:

Configurator — инициализирует HttpClient, Service, Controller, ...
Controller — принимает Service, обрабатывает API вызовы и передает сервису
Service — уровень логики, берет на себя таски в фоне

В коде

Configurator

// ...

@Configurator
public class SomeContextConfigurator {

    @Bean
    public SomeController someController( ... ) {
        return new SomeController(someService, ...);
    }

    @Bean
    public SomeService someService(
        ...
    ) {
        return new SomeService(...);
    }

    @Bean
    public CloseableHttpClient httpClient(
        ...
    ) {
        ApacheHttpClientUtils.Builder builder = ApacheHttpClientUtils.Builder.create()
            .multiThreaded()
            . // ...
        
        return builder.build();
    }
}

// ...

Controller

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;


@RestController
@RequestMapping(value = "/some")
public class SomeController {

    private final SomeService someService;

    public SomeController(
        SomeService someService
    ) {
        this.someService = someService;
    }

    @RequestMapping(value = "send", method = RequestMethod.POST)
    public SomeResult someAction(
        @RequestParam("post_param") String postParam
    ) {
        // ...
        someService.someAction(postParam);
        // ...
    }

}

Service

Interface

public interface SomeService {

    SomeResult someAction(String postParam);

}

Impl

public class ConnectorSendSmsServiceImpl implements ConnectorSendSmsService {

    // ...
    
}