Microsoft Azure Sends A Ping Event To The Registered Url

The request body of the POST request sent to the registered web hook URL is of the same shape as in the GET request for a specific hook.The Swagger Schema ID of the model is WebHookV3. The request will contain a X-MicrosoftSpeechServices-Event header with the value ping. If the web hook was registered witha secret it will contain a X-MicrosoftSpeechServices-Signature header with an SHA256 hash of the payload withthe secret as HMAC key. The hash is base64 encoded.