.../api/{id}/auth - работает =)

src/main/java/com/example/nto/controller/EmployeeController.java

@@ -2,7 +2,10 @@ package com.example.nto.controller;
 
 import com.example.nto.entity.Employee;
 import com.example.nto.service.EmployeeService;
+import com.example.nto.service.impl.EmployeeServiceImpl;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
 import java.net.http.HttpResponse;
@@ -15,12 +18,8 @@ import java.util.List;
  * НЕЛЬЗЯ: Изменять название класса и пакета
  */
 @RestController
-@RequestMapping("code")
+@RequestMapping("api")
 public class EmployeeController {
-//    @GetMapping("/auth/{id}")
-//    public int isAuth(@PathVariable int id){
-//        return id;
-//    }
 
     private final EmployeeService employeeService;
 
@@ -31,6 +30,12 @@ public class EmployeeController {
 
     @GetMapping("/{id}/auth")
     public HttpStatus Isauth(@PathVariable long id){
-        return HttpStatus.OK;
+        if(employeeService.isIdValid(id)){
+            return HttpStatus.OK;
+        }
+        else
+            return HttpStatus.NOT_FOUND;
     }
+
+
 }

src/main/java/com/example/nto/service/EmployeeService.java

@@ -15,4 +15,6 @@ public interface EmployeeService {
     List<Employee> getAll();
 
     Optional<Employee> getById(long id);
+
+    boolean isIdValid(long id);
 }

src/main/java/com/example/nto/service/impl/EmployeeServiceImpl.java

@@ -3,6 +3,7 @@ package com.example.nto.service.impl;
 import com.example.nto.entity.Employee;
 import com.example.nto.repository.EmployeeRepository;
 import com.example.nto.service.EmployeeService;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 import org.springframework.stereotype.Service;
 
@@ -20,6 +21,7 @@ import java.util.Optional;
 public class EmployeeServiceImpl implements EmployeeService {
     private final EmployeeRepository employeeRepository;
 
+    @Autowired
     public EmployeeServiceImpl(EmployeeRepository employeeRepository) {
         this.employeeRepository = employeeRepository;
     }
@@ -33,4 +35,8 @@ public class EmployeeServiceImpl implements EmployeeService {
     public Optional<Employee> getById(long id) {
         return employeeRepository.findById(id);
     }
+
+    public  boolean isIdValid(long id){
+        return employeeRepository.findById(id).isPresent();
+    }
 }