src/vs/platform/extensionResourceLoader/common/extensionResourceLoader.ts/AbstractExtensionResourceLoaderService/_getExtensionGalleryAuthority
class AbstractExtensionResourceLoaderService:	private _getExtensionGalleryAuthority(uri: URI): string | undefined {
		if (this._isWebExtensionResourceEndPoint(uri)) {
			return uri.authority;
		}
		const index = uri.authority.indexOf('.');
		return index !== -1 ? uri.authority.substring(index + 1) : undefined;
	}