Angular Universal Express 服务器不断加载并因 ERR_EMPTY_RESPONSE 而失败

Question

我有一个 Angular 应用程序，我正在尝试使用 Angular 通用 (https://angular.io/guide/universal) 进行服务器端渲染，但它似乎不起作用。我捆绑了我的应用程序并通过 express 运行它，我点击了 http://localhost:4000它一直在加载，直到我从浏览器中看到 ERR_EMPTY_RESPONSE

我已经尝试了几乎所有方法，但没有运气!任何帮助将不胜感激

这是我的代码的详细信息

package.json

{
  "name": "my-app",
  "version": "3.0.0",
  "author": "N/A",
  "description": "N/A",
  "scripts": {
    "ng": "ng",
    "start": "ng serve --port 8000 --host 0.0.0.0",
    "build": "ng build",
    "build:ssr": "npm run build:client-and-server-bundles && npm run webpack:server",
    "serve:ssr": "node dist/server.js",
    "build:client-and-server-bundles": "ng build --prod && ng run my-app:server",
    "webpack:server": "webpack --config webpack.server.config.js --progress --colors",
    "test": "ng test",
    "lint": "tslint ./src/**/*.ts -t verbose",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@agm/core": "^1.0.0-beta.5",
    "@angular/animations": "^7.2.0",
    "@angular/common": "^7.2.0",
    "@angular/compiler": "^7.2.0",
    "@angular/core": "^7.2.0",
    "@angular/forms": "^7.2.0",
    "@angular/http": "^7.2.0",
    "@angular/platform-browser": "^7.2.0",
    "@angular/platform-browser-dynamic": "^7.2.0",
    "@angular/router": "^7.2.0",
    "@angular/upgrade": "^7.0.0",
    "@nguniversal/common": "^6.0.0",
    "@nguniversal/express-engine": "^7.0.0",
    "@nguniversal/module-map-ngfactory-loader": "^7.1.0",
    "@types/jquery": "^3.3.28",
    "@types/swiper": "^4.4.1",
    "angular-in-memory-web-api": "^0.6.0",
    "angular2-text-mask": "^9.0.0",
    "bootstrap": "^4.1.3",
    "core-js": "^2.5.4",
    "express": "^4.16.4",
    "fullcalendar": "^3.10.0",
    "moment": "^2.23.0",
    "ng-fullcalendar": "^1.7.1",
    "ngx-google-places-autocomplete": "^2.0.3",
    "ngx-infinite-scroll": "^7.0.1",
    "ngx-slick": "^0.2.1",
    "reflect-metadata": "^0.1.10",
    "replace-in-file": "^3.4.3",
    "rxjs": "^6.3.3",
    "swiper": "^4.4.6",
    "zone.js": "^0.8.27"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.12.1",
    "@angular/cli": "~7.2.1",
    "@angular/compiler-cli": "^7.2.0",
    "@angular/language-service": "^7.2.0",
    "@angular/platform-server": "^7.2.4",
    "@compodoc/compodoc": "^1.1.7",
    "@types/jasmine": "~3.3.4",
    "@types/jasminewd2": "~2.0.6",
    "@types/node": "~10.12.17",
    "codelyzer": "~4.5.0",
    "jasmine-core": "~3.3.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "^3.1.4",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.4",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.0",
    "protractor": "~5.4.1",
    "ts-node": "~7.0.1",
    "tslint": "^5.12.1",
    "typescript": "~3.2.2",
    "webpack-cli": "^3.2.3",
    "karma-phantomjs-launcher": "^1.0.2",
    "lodash": "^4.16.2",
    "phantomjs-prebuilt": "^2.1.7",
    "ts-loader": "^4.5.0"
  }
}

src/app/app.module.ts

import { NgModule } from '@angular/core';
import { HttpClientModule } from '@angular/common/http';
import { CommonModule } from '@angular/common';
import { BrowserModule, BrowserTransferStateModule } from '@angular/platform-browser';
import { TransferHttpCacheModule } from '@nguniversal/common';

// Modules
import { CoreModule } from './core/core.module';
import { SharedModule } from './shared/shared.module';
import { ConfigModule } from './configs/config.module';

// Routing
import { AppRoutingModule } from './app-routing.module';

// Components
import { AppComponent } from './app.component';


@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule.withServerTransition({appId: 'my-app'}),
    BrowserTransferStateModule,
    TransferHttpCacheModule,
    CommonModule,
    AppRoutingModule,
    HttpClientModule,
    CoreModule,
    SharedModule,
    ConfigModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule {}

src/app/app.server.module.ts

import { NgModule } from '@angular/core';
import { ServerModule, ServerTransferStateModule } from '@angular/platform-server';
import { ModuleMapLoaderModule } from '@nguniversal/module-map-ngfactory-loader';

import { AppModule } from './app.module';
import { AppComponent } from './app.component';


@NgModule({
  imports: [
    AppModule,
    ServerModule,
    ModuleMapLoaderModule,
    ServerTransferStateModule
  ],
  providers: [],
  bootstrap: [AppComponent],
})
export class AppServerModule {}

ma​​in.server.ts

export { AppServerModule } from './app/app.server.module';

tsconfig.server.json

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "module": "commonjs",
    "types": []
  },
  "exclude": [
    "test.ts",
    "**/*.spec.ts"
  ],
  "angularCompilerOptions": {
    "entryModule": "app/app.server.module#AppServerModule"
  }
}

angular.json

...
     "server" : {
          "builder": "@angular-devkit/build-angular:server",
          "options": {
            "outputPath": "dist/server",
            "main": "src/main.server.ts",
            "tsConfig": "src/tsconfig.server.json",
            "fileReplacements": [
              {
                "replace": "src/environments/environment.ts",
                "with": "src/environments/environment.prod.ts"
              }
            ],
            "optimization": true,
            "sourceMap": false
          }
        }
...

在这些更改之后，我能够使用 ng build --prod && ng run my-app:server 成功捆绑浏览器、服务器分发版

这是我的server.ts

// These are important and needed before anything else
import 'zone.js/dist/zone-node';
import 'reflect-metadata';

import { enableProdMode } from '@angular/core';
import { ngExpressEngine } from '@nguniversal/express-engine';

import * as express from 'express';
import { join } from 'path';

const DIST_FOLDER = join(process.cwd(), 'dist');

// Faster server renders w/ Prod mode (dev mode never needed)
enableProdMode();

const domino = require('domino');
const fs = require('fs');
const path = require('path');
const template = fs.readFileSync(join(DIST_FOLDER, 'browser', 'index.html')).toString();
const win = domino.createWindow(template);

global['window'] = win;
global['document'] = win.document;
global['DOMTokenList'] = win.DOMTokenList;
global['Node'] = win.Node;
global['Text'] = win.Text;
global['HTMLElement'] = win.HTMLElement;
global['navigator'] = win.navigator;
global['CSS'] = null;
global['Event'] = win.Event;
global['Event']['prototype'] = win.Event.prototype;

Object.defineProperty(win.document.body.style, 'transform', {
  value: () => {
    return {
      enumerable: true,
      configurable: true
    };
  },
});

// Express server
const app = express();

const PORT = process.env.PORT || 4000;

const { AppServerModuleNgFactory, LAZY_MODULE_MAP } = require('./dist/server/main');
const { provideModuleMap } = require('@nguniversal/module-map-ngfactory-loader');

app.engine('html', ngExpressEngine({
  bootstrap: AppServerModuleNgFactory,
  providers: [
    provideModuleMap(LAZY_MODULE_MAP)
  ]
}));

app.set('view engine', 'html');
app.set('views', join(DIST_FOLDER, 'browser'));

// Server static files from /browser
app.get('*.*', express.static(join(DIST_FOLDER, 'browser')));

// All regular routes use the Universal engine
app.get('*', (req, res) => {
  res.render('index', { req });
});

// Start up the Node server
app.listen(PORT, () => {
  console.log(`Node server listening on http://localhost:${PORT}`);
});

和webpack.server.config.js

const path = require('path');
const webpack = require('webpack');

module.exports = {
  entry: { server: './server.ts' },
  resolve: { extensions: ['.js', '.ts'] },
  target: 'node',
  mode: 'none',
  // this makes sure we includes node_modules and other 3rd party libraries
  externals: [/(node_modules|main(\\|\/)..*(\\|\/).js)/],
  output: {
    path: path.join(__dirname, 'dist'),
    filename: '[name].js'
  },
  module: {
    rules: [
      { test: /\.ts$/, loader: 'ts-loader' },
      {
        // Mark files inside `@angular/core` as using SystemJS style dynamic imports.
        // Removing this will cause deprecation warnings to appear.
        test: /(\\|\/)@angular(\\|\/)core(\\|\/).+\.js$/,
        parser: { system: true },
      },
    ]
  },
  plugins: [
    // Temporary Fix for issue: https://github.com/angular/angular/issues/11580
    // for 'WARNING Critical dependency: the request of a dependency is an expression'
    new webpack.ContextReplacementPlugin(
      /(.+)?angular(\\|\/)core(.+)?/,
      path.join(__dirname, 'src'), // location of your src
      {} // a map of your routes
    ),
    new webpack.ContextReplacementPlugin(
      /(.+)?express(\\|\/)(.+)?/,
      path.join(__dirname, 'src'),
      {}
    ),
    new webpack.ProvidePlugin({
      $: "jquery",
      jQuery: "jquery",
      "window.jQuery": "jquery"
    })
  ]
};

npm run build:ssr && npm run serve:ssr -> http://localhost:4000 -> 继续加载 -> ERR_EMPTY_RESPONSE

Answer 1

我能够通过确保我的 Angular 应用程序与平台无关来解决这个问题，即通过制作特定于浏览器的代码、浏览器 API 方法或浏览器类型，例如 window、document , 或 localStorage 仅在浏览器中运行。

例如:if (isPlatformBrowser(this.platformId)) {//客户端代码 }