Having an issue with Dialogflow API WebhookResponse V2 for Actions for Google - sinatra

Question

I'm testing Actions for Google, so I created some simple Sinatra application which looks something like:
require 'sinatra'
require 'json'
post '/google_assistant_api' do
content_type :json
case intent_name
when "input_welcome"
decorated_response
when "Recipe name"
basic_card
end
end
private
def decorated_response
{
source: "test source",
speech: "speech",
display_text: "something"
}.to_json
end
def intent_name
parsed_request["queryResult"]["intent"]["displayName"]
end
def parsed_request
#parsed_request ||= JSON.parse(request.body.read)
end
def basic_card
{
"fulfillmentText": "ACTIONS_ON_GOOGLE",
"fulfillmentMessages": [
{
"platform": "PLATFORM_UNSPECIFIED",
"text": {
"text": [
"string text"
]
},
"image": {
"imageUri": "https://avatars3.githubusercontent.com/u/119195?
s=400&v=4"
},
"basicCard": {
"title": "title string",
"subtitle": "subtitle",
"formattedText": "formatted text",
"image": {
"imageUri": "https://avatars3.githubusercontent.com/u/119195"
},
"buttons": []
}
}
],
"source": "source string"
}.to_json
end
Please note that I'm using V2 of the API and testing using google assistant:
I tried many other response formats based on https://gist.github.com/manniru/f52af230669bd3ed2e69ffe4a76ab309 with no luck. I keep getting:
Sorry! there was no response from the Agent. Please try later.
Is there anyone who tried non nodejs response with luck? I would appreciate any sample response as the simple response seems to be working, however as for the basic card I'm having no luck.

Answer 1

Dialogflow's v2 API uses a different format for webhook requests and responses which is documented here:
Dialogflow v2 Webhook Request
Dialogflow v2 Webhook Response
It appears that your code is using the old format.