src/vs/workbench/services/environment/browser/environmentService.ts/BrowserWorkbenchEnvironmentService/webviewExternalEndpoint
class BrowserWorkbenchEnvironmentService:	get webviewExternalEndpoint(): string {
		const endpoint = this.options.webviewEndpoint
			|| this.productService.webviewContentExternalBaseUrlTemplate
			|| 'https://{{uuid}}.vscode-webview.net/{{quality}}/{{commit}}/out/vs/workbench/contrib/webview/browser/pre/';

		return endpoint
			.replace('{{commit}}', this.payload?.get('webviewExternalEndpointCommit') ?? this.productService.commit ?? 'a81fff00c9dab105800118fcf8b044cd84620419')
			.replace('{{quality}}', this.productService.quality || 'insider');
	}