Error Happened while Verify webhook

Question

Facing this issue while verifying webhook in facebook chatbot also It's happening in dialogflow.

The URL couldn't be validated. Callback verification failed with the following errors: HTTP Status Code = 400; HTTP Message = Bad Request

Answer 1

Adding a webhook is really easy, you can make a php script that first just logs whatever it receives and put it in your website. Just make sure is HTTPS and has the correct permissions to run and save it:

lets say that you create post.php and hosted in https://example.com/facebook/post.php

The basic code for post.php could be:

<?php
$input = (file_get_contents('php://input'));

error_log("\n",3,'log.log');
error_log(print_r($input, true),3,'log.log');
error_log("\n-------------------------------\n\n",3,'log.log');

?>

make sure that you create log.log file and give the web server permission to write on it.

Good Luck.

Answer 2

Please take a look at the Dialogflow documentation for the Facebook integration: https://dialogflow.com/docs/integrations/facebook . Dialogflow will provide a webhook URL that you must add to your project on developers.facebook.com (which is what I believe you're having trouble with).

If you're trying to setup a webhook for Dialogflow, first setup the Facebook integration, as described above and then take a look at Dialogflow's documentation on fulfillment: https://dialogflow.com/docs/fulfillment