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Connecting Facebook Webhook to .net application

Connecting Facebook Webhook to .net application

Pravin Adak

9yAsked Aug 8, 2017, 2:55 AM2k.NET

I am trying to connect Facebook Webhook to my application(callback url).

But it throws error 'The URL couldn't be validated. Response does not match challenge' error.

Above is the screen of error I am getting.

Any help is greatly apprecialted.

Thanks

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Sundaram Subramanian9y ago
Try this code

var challenge = Convert.ToString(Request.QueryString["hub_challenge"]);
var verifyToken = Request.QueryString["hub_verify_token"];
Sundaram Subramanian9y ago
Check your query string mode
Pravin Adak9y ago
Hi,

Below is my code.

var challenge = Convert.ToString(Request.QueryString["hub.challenge"]);
var verifyToken = Request.QueryString["hub.verify_token"];
if (verifyToken == "abcxyz123")
{
Response.Write(challenge);
}

When I set callback url as this page URL from facebook it can find all values i.e. challenge and verifyToken but when it sends reponse webhook receives as shown in question.
Sundaram Subramanian9y ago
Change this Line if you have in your code

validate_requests: false.