Move to v2 API with express self hosting - actions-on-google

Question

I would like used the V2 API on my dialogflow fullfilment.
But when I self hosting an express, only v1 works, Why ?
With firebase functions both V1 and V2 works with the same code.
I apply this : https://developers.google.com/actions/reference/nodejs/lib-v1-migration,
Error for the welcome intent :
Request from simulator
{
"user": {
"userId": "ABwppHHtohp6Z0QsGp9X_TSwUK3gCxdRwCZ5w3kXR-iI-aXiUSNZR3Vuo59vocUIgP80gE2qWs2SFKk-fI6g83YJjA",
"locale": "fr-CA",
"lastSeen": "2019-02-25T15:29:15Z"
},
"conversation": {
"conversationId": "ABwppHHfpVWINKIQFvk-bzrVSvu4s-8JexXgZXP7FQ-NQ5HmPAneHtGY0u86_llCV--tj3TZpMtCMIMCZakyxc7mYQ",
"type": "NEW"
},
"inputs": [
{
"intent": "actions.intent.MAIN",
"rawInputs": [
{
"inputType": "KEYBOARD",
"query": "Parler avec le diable"
}
]
}
],
"surface": {
"capabilities": [
{
"name": "actions.capability.SCREEN_OUTPUT"
},
{
"name": "actions.capability.MEDIA_RESPONSE_AUDIO"
},
{
"name": "actions.capability.WEB_BROWSER"
},
{
"name": "actions.capability.AUDIO_OUTPUT"
}
]
},
"isInSandbox": true,
"availableSurfaces": [
{
"capabilities": [
{
"name": "actions.capability.SCREEN_OUTPUT"
},
{
"name": "actions.capability.WEB_BROWSER"
},
{
"name": "actions.capability.AUDIO_OUTPUT"
}
]
}
],
"requestType": "SIMULATOR"
}
reponse from simulator :
{
"responseMetadata": {
"status": {
"code": 10,
"message": "Failed to parse Dialogflow response into AppResponse because of empty speech response",
"details": [
{
"#type": "type.googleapis.com/google.protobuf.Value",
"value": "{\"id\":\"50104e9c-79ec-4545-a510-88ffd1944af7\",\"timestamp\":\"2019-02-25T15:32:35.568Z\",\"lang\":\"fr-ca\",\"result\":{},\"status\":{\"code\":206,\"errorType\":\"partial_content\",\"errorDetails\":\"Webhook call failed. Error: 400 Bad Request\"},\"sessionId\":\"ABwppHHfpVWINKIQFvk-bzrVSvu4s-8JexXgZXP7FQ-NQ5HmPAneHtGY0u86_llCV--tj3TZpMtCMIMCZakyxc7mYQ\"}"
}
]
}
}
}
Simulator :
Any idea ?

Answer 1

I found the issue. It was a wrong express configuration with bodyparser.
This is my code :
import express from 'express';
import { SERVER_NAME, ENTRY_POINT, PORT } from './constants';
import { app } from './app/app';
export const server = express();
server.set('port', PORT);
server.set('trust proxy', 'loopback');
server.use(express.json({}));
server.post(ENTRY_POINT, app);
server.get('/', (req, res) => {
res.send(SERVER_NAME);
});
just used express.use() instead body parser with express 4.16. It seems to me that it resolve the problem. Now V2 API with dialogflow seems works.