diff --git a/BililiveRecorder.Web/BasicAuthMiddleware.cs b/BililiveRecorder.Web/BasicAuthMiddleware.cs
index fef69c9..fe723fa 100644
--- a/BililiveRecorder.Web/BasicAuthMiddleware.cs
+++ b/BililiveRecorder.Web/BasicAuthMiddleware.cs
@@ -2,6 +2,7 @@ using System;
 using System.IO;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.FileProviders;
 using Microsoft.Net.Http.Headers;
 
@@ -11,21 +12,19 @@ namespace BililiveRecorder.Web
     {
         private readonly RequestDelegate next;
         private readonly ManifestEmbeddedFileProvider fileProvider;
-        private readonly BasicAuthCredential? credential;
         private const string BasicAndSpace = "Basic ";
 
         private static string? Html401Page;
 
-        public BasicAuthMiddleware(RequestDelegate next, ManifestEmbeddedFileProvider fileProvider, BasicAuthCredential? credential)
+        public BasicAuthMiddleware(RequestDelegate next, ManifestEmbeddedFileProvider fileProvider)
         {
             this.next = next ?? throw new ArgumentNullException(nameof(next));
             this.fileProvider = fileProvider ?? throw new ArgumentNullException(nameof(fileProvider));
-            this.credential = credential;
         }
 
         public Task InvokeAsync(HttpContext context)
         {
-            if (this.credential is null)
+            if (context.RequestServices.GetService<BasicAuthCredential>() is not { } credential)
             {
                 // 没有启用身份验证
                 return this.next(context);
@@ -45,7 +44,7 @@ namespace BililiveRecorder.Web
                 return this.ResponseWith401Async(context);
             }
 
-            if (this.credential.EncoededValue.Equals(requestCredential, StringComparison.Ordinal))
+            if (credential.EncoededValue.Equals(requestCredential, StringComparison.Ordinal))
             {
                 return this.next(context);
             }