How to use the ipwb.util.IPWBREPLAY_PORT function in ipwb

try:
        surtedURI = surt.surt(
                     path, path_strip_trailing_slash_unless_empty=False)
        indexPath = ipwbUtils.getIPWBReplayIndexPath()

        searchString = surtedURI
        if datetime is not None:
            searchString = surtedURI + ' ' + datetime

        cdxjLine = getCDXJLine_binarySearch(searchString, indexPath)

    except Exception as e:
        print(sys.exc_info()[0])
        respString = ('{0} not found :(' +
                      ' <a href="http://{1}:{2}">Go home</a>').format(
            path, IPWBREPLAY_HOST, IPWBREPLAY_PORT)
        return Response(respString)
    if cdxjLine is None:  # Resource not found in archives
        return generateNoMementosInterface(path, datetime)

    cdxjParts = cdxjLine.split(" ", 2)
    jObj = json.loads(cdxjParts[2])
    datetime = cdxjParts[1]

    digests = jObj['locator'].split('/')

    class HashNotFoundError(Exception):
        pass

    payload = None
    header = None
    try:

# Perform checks for CDXJ file existence, TODO: reuse cached contents
    app.cdxjFileContents = getIndexFileContents(cdxjFilePath)

    try:
        print('IPWB replay started on http://{0}:{1}'.format(
            IPWBREPLAY_HOST, IPWBREPLAY_PORT
        ))
        app.run(host='0.0.0.0', port=IPWBREPLAY_PORT)
    except gaierror:
        print('Detected no active Internet connection.')
        print('Overriding to use default IP and port configuration.')
        app.run()
    except socketerror:
        print('Address {0}:{1} already in use!'.format(
            IPWBREPLAY_HOST, IPWBREPLAY_PORT))
        sys.exit()