DialogFlow Cx webhook response results in "ErrorCode": "INVALID

I'm struggling to get my dialogflow Cx webhook response accepted by dialogflow. I am testing my agent from the dialogflow console and am successfully reaching my webhook endpoint and extracting the intent and switching to the correct place in my PHP code. I then build a simple text response and echo it. My response is always met with an error in the console debug window: "ErrorCode": "INVALID_ARGUMENT", "ErrorMessage": "Failed to parse webhook response:" My webhook code is:

header('Content-Type: application/json');
$jsonRequest = file_get_contents('php://input');
$data = json_decode($jsonRequest, true);
$intent = $data["intentInfo"]["displayName"];

file_put_contents("response1.log", print_r(json_encode($data), true));

switch ($intent){
      
case "myname":
$data = array (
  "fulfillment_response" => 
  array (
    "messages" => 
    array (
      0 => 
      array (
        "text" => 
        array (
          "text" => "Intent -> My name is Harry"
        ),
      ),
    ),
  )
);
}      
   echo json_encode($data);
   file_put_contents("response1.log", print_r(json_encode($data), true));
   die();

My response message json which is sent looks clean and is:

{
    "fulfillment_response": {
        "messages": [
            {
                "text": {
                    "text": "Intent -> My name is Harry"
                }
            }
        ]
    }
}

The error shown in the diloagflow console debug window is the following:

"Status": {
                "ErrorMessage": "Failed to parse webhook response: [{\"fulfillment_response\":{\"messages\":[{\"text\":{\"text\":\"Intent My name is Harry\"}}]}}]",
                "ErrorCode": "INVALID_ARGUMENT"              }
            }

OK, I have made some progress with this and the error has cleaned up considerably but it still looks like the quote characters " are being escaped \ for some reason. I have tried several flags with json_encode but to no avail. All suggestions are welcome...

CodePudding user response：

The main reason for this error is that you are returning the payload in wrong format please use the following and I hope it will work:

{
  "fulfillment_response": {
        "messages": [
            {
                "text": {
                    "text": [
                        "Webhook Response"
                    ]
                }
            }
        ]
    }
}