Clean up Rate Limit sample (dotnet#19)

Author: Rick-Anderson

fundamentals/middleware/rate-limit/WebRateLimitAuth/Program.cs

@@ -148,8 +148,6 @@
 using Microsoft.AspNetCore.Identity;
 using Microsoft.AspNetCore.RateLimiting;
 using Microsoft.EntityFrameworkCore;
-using Microsoft.Extensions.Logging.Abstractions;
-using Microsoft.Extensions.Options;
 using WebRateLimitAuth;
 using WebRateLimitAuth.Data;
 using WebRateLimitAuth.Models;

fundamentals/middleware/rate-limit/WebRateLimitAuth/SampleRateLimiterPolicy.cs

@@ -1,10 +1,12 @@
+// <snippet_1>
 using System.Threading.RateLimiting;
 using Microsoft.AspNetCore.RateLimiting;
 using Microsoft.Extensions.Options;
 using WebRateLimitAuth.Models;
 
 namespace WebRateLimitAuth;
 
+// <snippet>
 public class SampleRateLimiterPolicy : IRateLimiterPolicy<string>
 {
     private Func<OnRejectedContext, CancellationToken, ValueTask>? _onRejected;
@@ -15,7 +17,7 @@ public SampleRateLimiterPolicy(ILogger<SampleRateLimiterPolicy> logger,
     {
         _onRejected = (context, token) =>
         {
-            context.HttpContext.Response.StatusCode = 429;
+            context.HttpContext.Response.StatusCode = StatusCodes.Status429TooManyRequests;
             logger.LogWarning($"Request rejected by {nameof(SampleRateLimiterPolicy)}");
             return ValueTask.CompletedTask;
         };
@@ -24,6 +26,7 @@ public SampleRateLimiterPolicy(ILogger<SampleRateLimiterPolicy> logger,
 
     public Func<OnRejectedContext, CancellationToken, ValueTask>? 
                                                          OnRejected { get => _onRejected; }
+    // </snippet>
 
     public RateLimitPartition<string> GetPartition(HttpContext httpContext)
     {
@@ -37,3 +40,4 @@ public RateLimitPartition<string> GetPartition(HttpContext httpContext)
 
     }
 }
+// </snippet_1>