Fixing the registration for HstsConfigurationMiddleware

Author: soninaren

src/WebJobs.Script.WebHost/WebScriptHostBuilderExtension.cs

@@ -77,9 +77,9 @@ public static IHostBuilder AddWebScriptHost(this IHostBuilder builder, IServiceP
                     services.AddSingleton<DefaultScriptWebHookProvider>();
                     services.TryAddSingleton<IScriptWebHookProvider>(p => p.GetService<DefaultScriptWebHookProvider>());
                     services.TryAddSingleton<IWebHookProvider>(p => p.GetService<DefaultScriptWebHookProvider>());
-                    services.TryAddEnumerable(ServiceDescriptor.Singleton<IJobHostMiddlewarePipeline, DefaultMiddlewarePipeline>());
+                    services.TryAddSingleton<IJobHostMiddlewarePipeline, DefaultMiddlewarePipeline>();
                     services.TryAddEnumerable(ServiceDescriptor.Singleton<IJobHostHttpMiddleware, CustomHttpHeadersMiddleware>());
-                    services.TryAddSingleton<IJobHostHttpMiddleware, HstsConfigurationMiddleware>();
+                    services.TryAddEnumerable(ServiceDescriptor.Singleton<IJobHostHttpMiddleware, HstsConfigurationMiddleware>());
 
                     // Make sure the registered IHostIdProvider is used
                     IHostIdProvider provider = rootServiceProvider.GetService<IHostIdProvider>();