Fixes issues with HttpClientManager

Jellyfin.Server/Program.cs

@@ -118,8 +118,20 @@ namespace Jellyfin.Server
 
             SQLitePCL.Batteries_V2.Init();
 
+            // Increase the max http request limit
+            // The default connection limit is 10 for ASP.NET hosted applications and 2 for all others.
+            ServicePointManager.DefaultConnectionLimit = Math.Max(96, ServicePointManager.DefaultConnectionLimit);
+
+            // Disable the "Expect: 100-Continue" header by default
+            // http://stackoverflow.com/questions/566437/http-post-returns-the-error-417-expectation-failed-c
+            ServicePointManager.Expect100Continue = false;
+
+// CA5359: Do Not Disable Certificate Validation
+#pragma warning disable CA5359
+
             // Allow all https requests
             ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(delegate { return true; });
+#pragma warning restore CA5359
 
             var fileSystem = new ManagedFileSystem(_loggerFactory, appPaths);