How to use the icon-sdk-js.IconHttpProvider function in icon-sdk-js

constructor() {
		// HttpProvider is used to communicate with http.
		this.provider = new IconHttpProvider(MockData.NODE_URL);
		
		// Create IconService instance
        this.iconService = new IconService(this.provider);
        
        // Load wallet
        const { Wallet } = this.iconService;
        this.wallet = Wallet.loadPrivateKey(MockData.PRIVATE_KEY_1);
        this.txHash = '';

        this.addListener();
        this.getTokenBalance(MockData.WALLET_ADDRESS_1);
        this.getTokenBalance(MockData.WALLET_ADDRESS_2);
    }