def get_browser_url(address, port):
    """
    Returns the url to open the web browser.

    The argument 'address' should be an IP address. The argument 'port' should
    be an integer.
    """
    browser_url = 'http://'
    if address == '0.0.0.0':
        browser_url += 'localhost'
    else:
        browser_url += address
    if not port == 80:
        browser_url += ":%d" % port
    return browser_url