feat(@angular/cli): add option to set dev server's base serve path

packages/@angular/cli/commands/serve.ts

@@ -26,6 +26,7 @@ export interface ServeTaskOptions extends BuildOptions {
   sslCert?: string;
   open?: boolean;
   hmr?: boolean;
+  servePath?: string;
 }
 
 // Expose options unrelated to live-reload to other commands that need to run serve
@@ -96,6 +97,11 @@ export const baseServeCommandOptions: any = overrideOptions([
     default: false,
     description: 'Don\'t verify connected clients are part of allowed hosts.',
   },
+  {
+    name: 'serve-path',
+    type: String,
+    description: 'The pathname where the app will be served.'
+  },
   {
     name: 'hmr',
     type: Boolean,

packages/@angular/cli/tasks/serve.ts

@@ -17,6 +17,39 @@ const SilentError = require('silent-error');
 const opn = require('opn');
 const yellow = require('chalk').yellow;
 
+function findDefaultServePath(baseHref: string, deployUrl: string): string | null {
+  if (!baseHref && !deployUrl) {
+    return '';
+  }
+
+  if (/^(\w+:)?\/\//.test(baseHref) || /^(\w+:)?\/\//.test(deployUrl)) {
+    // If baseHref or deployUrl is absolute, unsupported by ng serve
+    return null;
+  }
+
+  // normalize baseHref
+  // for ng serve the starting base is always `/` so a relative
+  // and root relative value are identical
+  const baseHrefParts = (baseHref || '')
+    .split('/')
+    .filter(part => part !== '');
+  if (baseHref && !baseHref.endsWith('/')) {
+    baseHrefParts.pop();
+  }
+  const normalizedBaseHref = baseHrefParts.length === 0 ? '/' : `/${baseHrefParts.join('/')}/`;
+
+  if (deployUrl && deployUrl[0] === '/') {
+    if (baseHref && baseHref[0] === '/' && normalizedBaseHref !== deployUrl) {
+      // If baseHref and deployUrl are root relative and not equivalent, unsupported by ng serve
+      return null;
+    }
+    return deployUrl;
+  }
+
+  // Join together baseHref and deployUrl
+  return `${normalizedBaseHref}${deployUrl || ''}`;
+}
+
 export default Task.extend({
   run: function (serveTaskOptions: ServeTaskOptions, rebuildDoneCb: any) {
     const ui = this.ui;
@@ -156,10 +189,29 @@ export default Task.extend({
       }
     }
 
+    let servePath = serveTaskOptions.servePath;
+    if (!servePath && servePath !== '') {
+      const defaultServePath =
+        findDefaultServePath(serveTaskOptions.baseHref, serveTaskOptions.deployUrl);
+      if (defaultServePath == null) {
+        ui.writeLine(oneLine`
+            ${chalk.yellow('WARNING')} --deploy-url and/or --base-href contain
+            unsupported values for ng serve.  Default serve path of '/' used.
+            Use --serve-path to override.
+          `);
+      }
+      servePath = defaultServePath || '';
+    }
+    if (servePath.endsWith('/')) {
+      servePath = servePath.substr(0, servePath.length - 1);
+    }
+    if (!servePath.startsWith('/')) {
+      servePath = `/${servePath}`;
+    }
     const webpackDevServerConfiguration: IWebpackDevServerConfigurationOptions = {
       headers: { 'Access-Control-Allow-Origin': '*' },
       historyApiFallback: {
-        index: `/${appConfig.index}`,
+        index: `${servePath}/${appConfig.index}`,
         disableDotRule: true,
         htmlAcceptHeaders: ['text/html', 'application/xhtml+xml']
       },
@@ -177,7 +229,8 @@ export default Task.extend({
       },
       contentBase: false,
       public: serveTaskOptions.publicHost,
-      disableHostCheck: serveTaskOptions.disableHostCheck
+      disableHostCheck: serveTaskOptions.disableHostCheck,
+      publicPath: servePath
     };
 
     if (sslKey != null && sslCert != null) {
@@ -187,13 +240,6 @@ export default Task.extend({
 
     webpackDevServerConfiguration.hot = serveTaskOptions.hmr;
 
-    // set publicPath property to be sent on webpack server config
-    if (serveTaskOptions.deployUrl) {
-      webpackDevServerConfiguration.publicPath = serveTaskOptions.deployUrl;
-      (webpackDevServerConfiguration.historyApiFallback as any).index =
-        serveTaskOptions.deployUrl + `/${appConfig.index}`;
-    }
-
     if (serveTaskOptions.target === 'production') {
       ui.writeLine(chalk.red(stripIndents`
         ****************************************************************************************
@@ -208,7 +254,7 @@ export default Task.extend({
     ui.writeLine(chalk.green(oneLine`
       **
       NG Live Development Server is listening on ${serveTaskOptions.host}:${serveTaskOptions.port},
-      open your browser on ${serverAddress}
+      open your browser on ${serverAddress}${servePath}
       **
     `));
 

tests/e2e/tests/commands/serve/serve-path.ts

@@ -0,0 +1,29 @@
+import { request } from '../../../utils/http';
+import { killAllProcesses } from '../../../utils/process';
+import { ngServe } from '../../../utils/project';
+
+export default function () {
+  return Promise.resolve()
+    .then(() => ngServe('--serve-path', 'test/'))
+    .then(() => request('http://localhost:4200/test'))
+    .then(body => {
+      if (!body.match(/<app-root><\/app-root>/)) {
+        throw new Error('Response does not match expected value.');
+      }
+    })
+    .then(() => request('http://localhost:4200/test/abc'))
+    .then(body => {
+      if (!body.match(/<app-root><\/app-root>/)) {
+        throw new Error('Response does not match expected value.');
+      }
+    })
+    .then(() => killAllProcesses(), (err) => { killAllProcesses(); throw err; })
+    .then(() => ngServe('--base-href', 'test/'))
+    .then(() => request('http://localhost:4200/test'))
+    .then(body => {
+      if (!body.match(/<app-root><\/app-root>/)) {
+        throw new Error('Response does not match expected value.');
+      }
+    })
+    .then(() => killAllProcesses(), (err) => { killAllProcesses(); throw err; });
+}