небольшая добавка чтоб понять что происходит вообще...

balakhonov_danila_lab_3/ApiRestaurant/Controllers/RestaurantController.cs

@@ -22,7 +22,7 @@ public class RestaurantController : ControllerBase
     [HttpGet("{id}")]
     public async Task<ActionResult<Restaurant?>> GetOne(Guid id) {
         var restaurant = await _context.Restaurants.FindAsync(id);
-        if (restaurant == null) return NotFound();
+        if (restaurant == null) return NotFound($"Restourant with [id: '{id}'] not found");
         var waiters = await WaiterApiClient.GetAllForRestaurant(id);
         restaurant.Waiters = waiters;
         return restaurant;

balakhonov_danila_lab_3/ApiRestaurant/NetworkSupport.cs

@@ -0,0 +1,28 @@
+namespace ApiRestaurant;
+
+public static class NetworkSupport 
+{
+    public static async Task CheckConnectionAsync(string address)
+    {
+        using (var client = new HttpClient())
+            {
+                try
+                {
+                    var response = await client.GetAsync(address);
+
+                    if (response.IsSuccessStatusCode)
+                    {
+                        Console.WriteLine($"Соединение успешно проверено. Статус-код: {response.StatusCode}");
+                    }
+                    else
+                    {
+                        Console.WriteLine($"Соединение не удалось проверить. Статус-код: {response.StatusCode}");
+                    }
+                }
+                catch (HttpRequestException ex)
+                {
+                    Console.WriteLine($"Ошибка при проверке соединения: {ex.Message}");
+                }
+            }
+    }
+}

balakhonov_danila_lab_3/ApiRestaurant/Program.cs

@@ -8,6 +8,7 @@ var waiterApiAddress =
     Environment.GetEnvironmentVariable("WAITER_API_URL")
     ?? "http://localhost:4000/waiters/";
 WaiterApiClient.Setup(waiterApiAddress);
+await NetworkSupport.CheckConnectionAsync(waiterApiAddress);
 
 // Add services to the container.
 builder.Services.AddControllers();

balakhonov_danila_lab_3/docker-compose.yaml

@@ -2,7 +2,7 @@ services:
   restaurant_service:
     build: ./ApiRestaurant/
     environment:
-      WAITER_API_URL: http://localhost:80/waiters/
+      WAITER_API_URL: http://waiter_service:4000/waiters/
     expose:
       - 8080
     depends_on: