I have tried to create my first Dialogflow to retrieve bitcoin price and it failed. Help needed.

I have followed the following guide but it didn't work!

https://www.youtube.com/watch?v=ykSFAs6S_Kg

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I am thinking it is because of the following link that we were given to enter in Fulfillment as a webhook.

https://us-central1-bitcoin-info-io17.cloudfunctions.net/bitcoininfo

When i access that webpage i get the following message: *Action Error: Missing result from request body*

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I would like to do this to begin with so that i can develop more complicated programs later on.

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I'd really appreciate your help as i couldn't find a solution online. (note: I have very little to no programming knowledge)

Thanks! :)