diff --git a/FastGithub.Scanner/GithubDnsHttpHandler.cs b/FastGithub.Scanner/GithubDnsHttpHandler.cs
deleted file mode 100644
index 69b2033..0000000
--- a/FastGithub.Scanner/GithubDnsHttpHandler.cs
+++ /dev/null
@@ -1,54 +0,0 @@
-using Microsoft.Extensions.DependencyInjection;
-using System;
-using System.Net.Http;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace FastGithub.Scanner
-{
-    /// <summary>
-    /// Github的dns解析的httpHandler
-    /// 使扫描索结果作为github的https请求的域名解析
-    /// </summary>
-    [Service(ServiceLifetime.Transient)]
-    sealed class GithubDnsHttpHandler : DelegatingHandler
-    {
-        private readonly GithubScanResults scanResults;
-
-        /// <summary>
-        /// Github的dns解析的httpHandler
-        /// </summary>
-        public GithubDnsHttpHandler(GithubScanResults scanResults)
-        {
-            this.scanResults = scanResults;
-        }
-
-        /// <summary>
-        /// 发送消息
-        /// </summary>
-        /// <param name="request"></param>
-        /// <param name="cancellationToken"></param>
-        /// <returns></returns>
-        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
-        {
-            var uri = request.RequestUri;
-            if (uri != null && uri.HostNameType == UriHostNameType.Dns)
-            {
-                var address = this.scanResults.FindBestAddress(uri.Host);
-                if (address != null)
-                {
-                    var builder = new UriBuilder(uri)
-                    {
-                        Scheme = Uri.UriSchemeHttp,
-                        Host = address.ToString(),
-                        Port = 443
-                    };
-                    request.RequestUri = builder.Uri;
-                    request.Headers.Host = uri.Host;
-                }
-            }
-
-            return await base.SendAsync(request, cancellationToken);
-        }
-    }
-}
diff --git a/FastGithub.Scanner/LookupProviders/IPAddressComProvider.cs b/FastGithub.Scanner/LookupProviders/IPAddressComProvider.cs
index 82bb46d..9f158e8 100644
--- a/FastGithub.Scanner/LookupProviders/IPAddressComProvider.cs
+++ b/FastGithub.Scanner/LookupProviders/IPAddressComProvider.cs
@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Net;
 using System.Net.Http;
+using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading;
 using System.Threading.Tasks;
@@ -86,13 +87,11 @@ namespace FastGithub.Scanner.LookupProviders
         /// <returns></returns>
         private async Task<List<IPAddress>> LookupAsync(HttpClient httpClient, string domain, CancellationToken cancellationToken)
         {
-            var keyValue = new KeyValuePair<string?, string?>("host", domain);
-            var content = new FormUrlEncodedContent(Enumerable.Repeat(keyValue, 1));
             using var request = new HttpRequestMessage
             {
                 Method = HttpMethod.Post,
                 RequestUri = lookupUri,
-                Content = content
+                Content = new StringContent($"host={domain}", Encoding.UTF8, "application/x-www-form-urlencoded")
             };
 
             using var response = await httpClient.SendAsync(request, cancellationToken);
diff --git a/FastGithub.Scanner/ScannerServiceCollectionExtensions.cs b/FastGithub.Scanner/ScannerServiceCollectionExtensions.cs
index d8fa143..11f3c38 100644
--- a/FastGithub.Scanner/ScannerServiceCollectionExtensions.cs
+++ b/FastGithub.Scanner/ScannerServiceCollectionExtensions.cs
@@ -28,7 +28,6 @@ namespace FastGithub
             services
                 .AddHttpClient(nameof(Scanner))
                 .SetHandlerLifetime(TimeSpan.FromMinutes(5d))
-                .AddHttpMessageHandler<GithubDnsHttpHandler>()
                 .ConfigureHttpClient(httpClient =>
                 {
                     httpClient.Timeout = TimeSpan.FromSeconds(10d);