Proxy target was ignored when using bypass method.

Author: SpaceK33z

lib/Server.js

@@ -171,22 +171,23 @@ function Server(compiler, options) {
 				options.proxy.forEach(function(proxyConfig) {
 					var bypass = typeof proxyConfig.bypass === 'function';
 					var context = proxyConfig.context || proxyConfig.path;
+					var proxyMiddleware;
+					// It is possible to use the `bypass` method without a `target`.
+					// However, the proxy middleware has no use in this case, and will fail to instantiate.
+					if (proxyConfig.target) {
+						proxyMiddleware = httpProxyMiddleware(context, proxyConfig);
+					}
 
-					function bypassMiddleware(req, res, next) {
-						var bypassUrl = proxyConfig.bypass(req, res, proxyConfig) || false;
+					app.use(function(req, res, next) {
+						var bypassUrl = bypass && proxyConfig.bypass(req, res, proxyConfig) || false;
 
 						if(bypassUrl) {
 							req.url = bypassUrl;
+							next();
+						} else if (proxyMiddleware) {
+							return proxyMiddleware(req, res, next);
 						}
-
-						next();
-					}
-
-					if(bypass) {
-						app.use(bypassMiddleware);
-					} else {
-						app.use(httpProxyMiddleware(context, proxyConfig));
-					}
+					});
 				});
 			}
 		},