title: Microsoft bot framework v3 webchat channel not working with ngrok
body: <p>I created chatbot with microsoft bot framework v3.
  I use mssql server 2017 database.
  It runs perfectly on emulator. After that I registered my chatbot on azure through Bot channel registration.
  Then I save AppId and Password etc in web.config and also in emulator and tested, It runs without any error.
  I use ngrok , as ngrok http 3979 it gives me <a href="https://........ngrok.io" rel="nofollow noreferrer">https://........ngrok.io</a> and I save that access point in azure bot reg endpoint with api/messages.
  Then I get embed code with key and placed in page.html and when I send message it gives me error as:
  <img src="https://i.stack.imgur.com/jhJBv.png" alt="">
  <img src="https://i.stack.imgur.com/1YszR.png" alt=""></p>