Connecting Facebook Webhook to .net application

Question

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

Sundar · Answer

Try this code var challenge = Convert.ToString(Request. QueryString[hub_challenge]); var verifyToken = Request .QueryString[hub_verify_token];

Sundar · Answer

Check your query string mode

Pravin Adak · Answer

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.

Sundar · Answer

Change this Line if you have in your code validate_requests: false.