Add developer exception page to webpack template

Author: dustinsoftware

src/React.Template/reactnet-webpack/Startup.cs

@@ -4,6 +4,7 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
 using React.AspNet;
 
 namespace React.Sample.Webpack.CoreMvc
@@ -33,7 +34,7 @@ public void ConfigureServices(IServiceCollection services)
 		}
 
 		// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
-		public void Configure(IApplicationBuilder app)
+		public void Configure(IApplicationBuilder app, IHostEnvironment env)
 		{
 			// Initialise ReactJS.NET. Must be before static files.
 			app.UseReact(config =>
@@ -45,6 +46,11 @@ public void Configure(IApplicationBuilder app)
 					.SetReactAppBuildPath("~/dist");
 			});
 
+			if (env.IsDevelopment())
+			{
+					app.UseDeveloperExceptionPage();
+			}
+
 			app.UseStaticFiles();
 
 			app.UseRouting();