Not receiving response from slack on Request URL set in Interactive Component

Question

From My application sending message in slack using chat.postmessage with a button inside json request. but when user clicks on button from slack it's not returning response on request URL.

https://api.slack.com/messaging/interactivity/enabling#responding_to_interactions

As mentioned here in above link, i have set the structure. set Request URL and also actions with callback id. in my app also set request URL method. i have checked that my application's request URL is working fine.

In attachment parameter passed json as below

[
  {
    "text": "Are you want to turn of this messages?",
    "fallback": "You are unable to turn off",
    "callback_id": "turn_off_message",
    "attachment_type": "default",
    "actions": [
      {
        "name": "turnoff",
        "text": "Turn Off",
        "type": "button",
        "value": "turnoff"
      }
    ]
  }
]

Once user click on Turn Off button, need a response on Request URL which i have set in Interactive Component.