Dialogflow V2 API says my Webhook response was empty

Question

I am trying to use the Dialogflow V2 API to add two numbers, to do this I have setup a web server with HTTPS access to complete the request. in the Diagnostic Info screen in the Dialogflow console I can see the Fulfilment Response from my remote server:

{
  "fulfillmentText": "the sum of 5 and 9 is 14",
  "fulfillmentMessages": [
    {
      "text": {
        "text": [
          "the sum of 5 and 9 is 14"
        ]
      }
    }
  ],
  "source": "-------.com",
  "payload": {
    "google": {
      "expectUserResponse": 1,
      "richResponse": {
        "items": [
          {
            "simpleResponse": {
              "textToSpeech": "the sum of 5 and 9 is 14"
            }
          }
        ]
      }
    },
    "facebook": {
      "text": "the sum of 5 and 9 is 14"
    },
    "slack": {
      "text": "the sum of 5 and 9 is 14"
    }
  },
  "outputContexts": [
    {
      "name": "-----892446d1-----",
      "lifespanCount": 1,
      "parameters": {
        "number": 5,
        "number1": 9
      }
    }
  ]
}

Which has been adapted from the example given in the docs: https://dialogflow.com/docs/intro/fulfillment but in the Raw API response I see:

"webhookStatus": {
    "code": 3,
    "message": "Webhook call failed. Error: Webhook response was empty."
  }

Clearly the response is not empty as it can be seen in the Diagnostic Info. Has anyone any ideas as to what is causing this?

Thanks

Can you try to reproduce this issue in a simplified version if your agent, and provide an exported zip file? — Daniel Situnayake, Oct 11 '18 at 23:39

score 0 · Answer 1 · answered Oct 18 '19 at 09:28

We can find definition of the codes in google.rpc package error codes,

"code": 3

means "INVALID_ARGUMENT"

// The client specified an invalid argument. Note that this differs
// from FAILED_PRECONDITION. INVALID_ARGUMENT indicates arguments // that are problematic regardless of the state of the system // (e.g., a malformed file name).

For example according to request format "parameters" field in "outputContexts" should have format "param": "param value", in your request it looks like "param": param value.

Please check all arguments in your request.

Dialogflow V2 API says my Webhook response was empty

1 Answers1