Rename Microsoft.AspNet.* packages folders to Microsoft.AspNetCore.*

src/Microsoft.AspNetCore.SpaServices/Webpack/ConditionalProxyMiddleware.cs

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+using System;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+
+namespace Microsoft.AspNet.SpaServices.Webpack
+{
+    // Based on https://github.com/aspnet/Proxy/blob/dev/src/Microsoft.AspNetCore.Proxy/ProxyMiddleware.cs
+    // Differs in that, if the proxied request returns a 404, we pass through to the next middleware in the chain
+    // This is useful for Webpack middleware, because it lets you fall back on prebuilt files on disk for
+    // chunks not exposed by the current Webpack config (e.g., DLL/vendor chunks).
+    internal class ConditionalProxyMiddleware {
+        private RequestDelegate next;
+        private ConditionalProxyMiddlewareOptions options;
+        private HttpClient httpClient;
+        private string pathPrefix;
+
+        public ConditionalProxyMiddleware(RequestDelegate next, string pathPrefix, ConditionalProxyMiddlewareOptions options)
+        {
+            this.next = next;
+            this.pathPrefix = pathPrefix;
+            this.options = options;
+            this.httpClient = new HttpClient(new HttpClientHandler());
+        }
+        
+        public async Task Invoke(HttpContext context)
+        {
+            if (context.Request.Path.StartsWithSegments(this.pathPrefix)) {
+                var didProxyRequest = await PerformProxyRequest(context);
+                if (didProxyRequest) {
+                    return;
+                }
+            }
+            
+            // Not a request we can proxy
+            await this.next.Invoke(context);
+        }
+        
+        private async Task<bool> PerformProxyRequest(HttpContext context) {
+            var requestMessage = new HttpRequestMessage();
+
+            // Copy the request headers
+            foreach (var header in context.Request.Headers) {
+                if (!requestMessage.Headers.TryAddWithoutValidation(header.Key, header.Value.ToArray()) && requestMessage.Content != null) {
+                    requestMessage.Content?.Headers.TryAddWithoutValidation(header.Key, header.Value.ToArray());
+                }
+            }
+            
+            requestMessage.Headers.Host = options.Host + ":" + options.Port;
+            var uriString = $"{options.Scheme}://{options.Host}:{options.Port}{context.Request.PathBase}{context.Request.Path}{context.Request.QueryString}";
+            requestMessage.RequestUri = new Uri(uriString);
+            requestMessage.Method = new HttpMethod(context.Request.Method);
+
+            using (var responseMessage = await httpClient.SendAsync(requestMessage, HttpCompletionOption.ResponseHeadersRead, context.RequestAborted)) {
+                if (responseMessage.StatusCode == HttpStatusCode.NotFound) {
+                    // Let some other middleware handle this
+                    return false;
+                }
+                
+                // We can handle this
+                context.Response.StatusCode = (int)responseMessage.StatusCode;                
+                foreach (var header in responseMessage.Headers) {
+                    context.Response.Headers[header.Key] = header.Value.ToArray();
+                }
+
+                foreach (var header in responseMessage.Content.Headers) {
+                    context.Response.Headers[header.Key] = header.Value.ToArray();
+                }
+
+                // SendAsync removes chunking from the response. This removes the header so it doesn't expect a chunked response.
+                context.Response.Headers.Remove("transfer-encoding");
+                await responseMessage.Content.CopyToAsync(context.Response.Body);
+                return true;
+            }
+        }
+    }
+    
+    internal class ConditionalProxyMiddlewareOptions {
+        public string Scheme { get; private set; }
+        public string Host { get; private set; }
+        public string Port { get; private set; }
+        
+        public ConditionalProxyMiddlewareOptions(string scheme, string host, string port) {
+            this.Scheme = scheme;
+            this.Host = host;
+            this.Port = port;
+        }
+    }
+}

src/Microsoft.AspNetCore.SpaServices/Webpack/WebpackDevMiddleware.cs

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+using System;
+using System.IO;
+using System.Threading.Tasks;
+using Microsoft.AspNet.NodeServices;
+using Microsoft.AspNet.SpaServices.Webpack;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.PlatformAbstractions;
+using Newtonsoft.Json;
+
+// Putting in this namespace so it's always available whenever MapRoute is
+namespace Microsoft.AspNetCore.Builder
+{
+    public static class WebpackDevMiddleware
+    {
+        const string WebpackDevMiddlewareScheme = "http";
+        const string WebpackDevMiddlewareHostname = "localhost";
+        const string WebpackHotMiddlewareEndpoint = "/__webpack_hmr";
+        const string DefaultConfigFile = "webpack.config.js";
+
+        public static void UseWebpackDevMiddleware(this IApplicationBuilder appBuilder, WebpackDevMiddlewareOptions options = null) {
+            // Validate options
+            if (options == null) {
+                options = new WebpackDevMiddlewareOptions();
+            }
+            if (options.ReactHotModuleReplacement && !options.HotModuleReplacement) {
+                throw new ArgumentException("To enable ReactHotModuleReplacement, you must also enable HotModuleReplacement.");
+            }
+
+            // Unlike other consumers of NodeServices, WebpackDevMiddleware dosen't share Node instances, nor does it
+            // use your DI configuration. It's important for WebpackDevMiddleware to have its own private Node instance
+            // because it must *not* restart when files change (if it did, you'd lose all the benefits of Webpack
+            // middleware). And since this is a dev-time-only feature, it doesn't matter if the default transport isn't
+            // as fast as some theoretical future alternative.
+            var hostEnv = (IHostingEnvironment)appBuilder.ApplicationServices.GetService(typeof (IHostingEnvironment));
+            var nodeServices = Configuration.CreateNodeServices(new NodeServicesOptions {
+                HostingModel = NodeHostingModel.Http,
+                ProjectPath = hostEnv.ContentRootPath,
+                WatchFileExtensions = new string[] {} // Don't watch anything
+            });
+
+            // Get a filename matching the middleware Node script
+            var script = EmbeddedResourceReader.Read(typeof (WebpackDevMiddleware), "/Content/Node/webpack-dev-middleware.js");
+            var nodeScript = new StringAsTempFile(script); // Will be cleaned up on process exit
+
+            // Tell Node to start the server hosting webpack-dev-middleware
+            var devServerOptions = new {
+                webpackConfigPath = Path.Combine(hostEnv.ContentRootPath, options.ConfigFile ?? DefaultConfigFile),
+                suppliedOptions = options
+            };
+            var devServerInfo = nodeServices.InvokeExport<WebpackDevServerInfo>(nodeScript.FileName, "createWebpackDevServer", JsonConvert.SerializeObject(devServerOptions)).Result;
+
+            // Proxy the corresponding requests through ASP.NET and into the Node listener
+            var proxyOptions = new ConditionalProxyMiddlewareOptions(WebpackDevMiddlewareScheme, WebpackDevMiddlewareHostname, devServerInfo.Port.ToString());
+            appBuilder.UseMiddleware<ConditionalProxyMiddleware>(devServerInfo.PublicPath, proxyOptions);
+
+            // While it would be nice to proxy the /__webpack_hmr requests too, these return an EventStream,
+            // and the Microsoft.Aspnet.Proxy code doesn't handle that entirely - it throws an exception after
+            // a while. So, just serve a 302 for those.
+            appBuilder.Map(WebpackHotMiddlewareEndpoint, builder => {
+                builder.Use(next => async ctx => {
+                    ctx.Response.Redirect($"{ WebpackDevMiddlewareScheme }://{ WebpackDevMiddlewareHostname }:{ devServerInfo.Port.ToString() }{ WebpackHotMiddlewareEndpoint }");
+                    await Task.Yield();
+                });
+            });
+        }
+
+        #pragma warning disable CS0649
+        class WebpackDevServerInfo {
+            public int Port;
+            public string PublicPath;
+        }
+        #pragma warning restore CS0649
+    }
+}

src/Microsoft.AspNetCore.SpaServices/Webpack/WebpackDevMiddlewareOptions.cs

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+namespace Microsoft.AspNet.SpaServices.Webpack {
+    public class WebpackDevMiddlewareOptions {
+        public bool HotModuleReplacement { get; set; }
+        public bool ReactHotModuleReplacement { get; set; }
+        public string ConfigFile { get; set; }
+    }
+}