The Angular Universal Express server is continuously loading and ultimately crashes, resulting in an ERR_EMPTY_RESPONSE

I'm struggling with getting my Angular app to work with server-side rendering using Angular Universal (https://angular.io/guide/universal). Despite bundling the app and running it through Express, when I visit http://localhost:4000, it just keeps loading until I eventually see an ERR_EMPTY_RESPONSE from the browser

I've tried various solutions without success. Any help or guidance on this issue would be greatly appreciated.

Here are some details from my code:

package.json

{
  "name": "my-app",
  "version": "3.0.0",
  "author": "N/A",
  ...
}

src/app/app.module.ts

import { NgModule } from '@angular/core';
...
export class AppModule {}

src/app/app.server.module.ts

import { NgModule } from '@angular/core';
...
export class AppServerModule {}

main.server.ts

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

tsconfig.server.json

...

angular.json

...

After implementing these changes, I was able to successfully bundle the browser and server distributions using

ng build --prod && ng run my-app:server

Here's a snippet from my server.ts

...

and the contents of webpack.server.config.js

...

Running

npm run build:ssr && npm run serve:ssr
leads to http://localhost:4000 which results in continuous loading leading to an ERR_EMPTY_RESPONSE

Answer №1

To resolve this issue, I ensured that my Angular application is independent of any specific platform by isolating browser-specific code, browser API methods, or browser-related objects like window, document, and localStorage to only execute in the browser environment.

For example:

if (isPlatformBrowser(this.platformId)) { // Code exclusive for the client }

Answer №2

It is important to remember that along with the aforementioned steps, it is also crucial to enclose setTimeout and location within a platform browser check. I came across this helpful gist which provides guidance on how to properly configure everything.

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