//Контроллер(localhost:8081), который слушает feign
@RestController
public class SimpleController {

    @PostMapping("/api/v1")
    public void postData(String message){
        System.out.println(message);
    }
}

@FeignClient(name = "bitrix-client", url = "http://localhost:8081")
public interface BitrixClient {

    @PostMapping("/api/v1")
    void postData(String message);
}

//Контроллер на localhost:8080
@RestController
@RequestMapping("/api")
public class BitrixController {

    @Autowired
    private BitrixClient bitrixClient;

    @PostMapping("/v1")
    public void postData(String message){
        bitrixClient.postData(message);
    }
}