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Ralf Kloth avatar image
Ralf Kloth asked Phong Vu commented

C# Webhook Subscription - Validation Token not in Header - Sandbox

In the Sandbox the "Validation-Token" is NOT returned in the Header (as described in the documentation) - in the RequestBody the Validation-Token is delivered:

{"validationToken":"d52ca641-1297-4784-ac69-5e04062f161b"}

In the Production environment this is different. There the token ist correctly delivered in the Header as "Validation-Token".

There seems to be a difference between Sandbox and Production environment!

Note: There must have been a change in the Sandbox lately because this also worked in the Sandbox in the past.

rest apiwebhooks
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Phong Vu answered Phong Vu commented

What is the Web framework you are running on?

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Ralf Kloth avatar image Ralf Kloth commented ·

We use Azure Functions and .NET 6.0.

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Phong Vu avatar image Phong Vu ♦♦ Ralf Kloth commented ·

Ok, so it looks like the latest change (only on sandbox for evaluation) has an impact on Azure. The change was that the validation-token is sent with the body is e.g.

{"validationToken":"f5520450-09d8-42b7-90d5-aa22282dccb8"}

And the content-length set with the length of the body. Can you show how the return of Validation-Token header is handled in your code?

Is it possible that Azure check the content-length != 0 and send the body only?

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Ralf Kloth avatar image Ralf Kloth Phong Vu ♦♦ commented ·

I could see the problem now.

In our code we checked if the content length was 0 and only then checked for the Validaten-Tken in the header. Because now the validationToken ist also send in the body - this code did not work anymore. When I change this it works again.

Note: Such a change may also impact other developers who may use a similar code as me!

Thanks for your help.

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