Unrestricted Angular Audio Playback without CORS Restrictions

I am currently developing a web application using Angular4 that will include the feature of playing audio files. Unfortunately, I am facing an issue where I do not have control over the server serving the media files, and therefore cannot make any modifications to the server settings.

When I directly create an audio element and play it, the audio playback works perfectly:

var audio = new Audio();
audio.src = item.url; // 'item' is an object containing the URL and title
audio.load();
audio.play();

However, when I utilize a player-class to manage the playback functionality, I encounter a CORS error due to inadequate headers being set for the mp3 items:

@Injectable
export class Player {
audio: any;

constructor(private zone: NgZone){
    this.initialize();
}

initialize(){
    if (!this.audio) {
        this.audio = new Audio();
        this.audio.autoplay.false;
        this.audio.preload = 'auto';
        this.audio.autobuffer = true;
        this.audio.crossOrigin = "anonymous";
    }
}

setUrl(url: string) {
    this.initialize();
    this.audio.pause();
    this.audio.src = url;
    this.audio.load();
}

play() {
    this.audio.play();
}

pause() {
    this.audio.pause();
}

}

The error message received upon attempting to play the audio indicates that the CORS policy restricts the playback of the item:

Uncaught (in promise) DOMException: Failed to load because no supported source was found.

Is there a possible workaround for this issue? And why does the direct calling of the audio element in the controller result in successful playback?

Answer №1

Essentially, CORS serves as a restriction enforced and managed by web browsers to prevent the loading or retrieval of cross-origin content using AJAX requests. One potential solution is to handle the reading and streaming of mp3 files through a server-side approach.

An effective workaround involves creating a proxy server that can relay mp3 streams without being constrained by CORS limitations. This can be achieved, for example, through the use of NodeJS.

You can set up a proxy server utilizing the CORS anywhere package: https://www.npmjs.com/package/cors-anywhere

Alternatively, you have the option to develop a custom proxy and integrate the CORS middleware: https://github.com/expressjs/cors

This workaround scenario would appear as follows:

┌─────────────────┐     ┌───────────────────────┐      ┌────────────┐
│   MP3 HOSTING   │     │      YOUR PROXY       │      │            │
│(CORS LIMITATION)│───▶ │ (NO CORS LIMITATION)  │────▶ │Your WebAPP │
│                 │     │                       │      │            │
└─────────────────┘     └───────────────────────┘      └────────────┘

As for why your initial example may have worked, it could be due to the browser recognizing certain content as safe to load without posing any security risks, therefore bypassing the CORS policy. For more insights, refer to: .

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