Attach Multichoices values to HttpPost header or body

[RonZhang724]

Now I have a dropdown of multichoices for the users to click on, and a 'send' button to make an Http call to my backend function. The idea is that whenever somebody make a choice from the fropdown, and make an HTTP post call to my backend function, the function will send a follow up message containing the information related to the user choice.

I was wondering if there is any way we could attach the choice values to the HTTP post call header or body?