Get POST from Slack upon button press

[atauln]

Hi! I'm using the button example documentation to create a Slack message that has a button on it. While I got the button to work, how would I go about receiving the POST message from the server when it's pressed? The code
http.HandleFunc("/actions", buttonHandler) http.ListenAndServe(":3000", nil)
never fires, even upon clicking the button within the message.

[kanata2]

Please give more details for your code, slack app configurations.