Http Webhook Outputs does not have body content, only headers

Question

Hi,

I set up the http webhook action in my logic app.
it posts the callback url to my Azure function with http trigger,
that queues a message to my other Azure function with queue trigger so I can do long running job

at the end, the queue triggered Azure function post back to the callbackUrl
the post clearly has json payload (which I logged with app insight along with response status code OK)
but in Logic Apps Http Webhook, it only shows the headers not anything in the body
it even show a special header "pubCount" I put there in the post request but nothing from the posted body content.

it's like this:
{
"headers": {
"Transfer-Encoding": "chunked",
"Host": "prod-125.westus.logic.azure.com",
"pubCount": "15",
"Request-Context": "appId=cid-v1:35980825-543f-479e-abe9-6effd9f72c59",
"Request-Id": "|0f02aa3bd52fcf4f98ec8b1249ae3533.01019e4b18689e48.",
"traceparent": "00-0f02aa3bd52fcf4f98ec8b1249ae3533-01019e4b18689e48-00",
"Content-Type": "application/json; charset=utf-8",
"Content-Length": "0"
}
}

Please let me know what I am missing in getting the final action result in the Webhook Outputs body. Thanks.

Answer 1

Based on the discussion in this issue, looks like chunked encoding is the default and hence the behavior that you see.

The solution would be to either set an explicit Content-Length header in your request or to use StringContent which does this for you. For example, I can confirm the following works

await _httpClient.PostAsync(callbackUrl, new StringContent(data, Encoding.UTF8, "application/json"));