@Emil
Thanks for your replying and advice. I could finally make it happen.

Hi all,
Could someone advise me how to set the Http request function for the flic hub? I tried to post a request to Node Red input which requires authentication. In a browser, when I put: http://nodered_ip:1880/test, the authentication box pop up for inputting username and password and the flow was triggered.
How should I do this on flic hub?
Thanks a lot