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

if not hostPort:
        ipwbUtils.setIPWBReplayConfig(IPWBREPLAY_HOST, IPWBREPLAY_PORT)

    if ipwbUtils.isDaemonAlive():
        ipwbUtils.setIPWBReplayIndexPath(cdxjFilePath)
        app.cdxjFilePath = cdxjFilePath
    else:
        print('Sample data not pulled from IPFS.')
        print('Check that the IPFS daemon is running.')

    # 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()