I followed all the steps as outlined in Chapter 2 of your book to create the first HelloWorld bot. I registered the bot, got the id and password and added to the webconfig and re-published. The app works in the Bot Framework Developer portal page. However, when I invoke the endpoint URL from the messaging endpoint filed (https://helloworldbot20170314122301.azurewebsites.net/api/messages) I get the following message:
The requested resource does not support http method 'GET'.