pref: 将Head和ETag请求设置为Connection: close

src/MaaWpfGui/Helper/ETagCache.cs

@@ -89,9 +89,8 @@ namespace MaaWpfGui.Helper
             var etag = force ? string.Empty : Get(url);
             Dictionary<string, string> headers = new Dictionary<string, string>
             {
-                {
-                    "Accept", "application/octet-stream"
-                },
+                { "Accept", "application/octet-stream" },
+                { "Connection", "close" },
             };
 
             if (!string.IsNullOrEmpty(etag))

src/MaaWpfGui/Services/Web/HttpService.cs

@@ -91,6 +91,8 @@ namespace MaaWpfGui.Services.Web
                     }
                 }
 
+                request.Headers.ConnectionClose = true;
+
                 var stopwatch = Stopwatch.StartNew();
                 var response = await _client.SendAsync(request).ConfigureAwait(false);
                 stopwatch.Stop();