>>>>Network tab on the browser debugger should show you the request ?
>>>>
>>>>Update: just realised that this must be on the server - in which case Fiddler should let you see the request that went over the wire
>>>
>>>I am using Google Chrome and I'm just running the code from VS - what should I do exactly?
>>
>>If you haven't got it then download and install Fiddler (https://www.telerik.com/download/fiddler). Open it - it should show you all internet traffic. Click on your request to show the details.
>
>I downloaded Fiddler and trying to figure out how to work with it. Also, my host is HTTPS. I see lots of irrelevant traffic.
>
>The one I am interested in shows (see attached). I am not sure what should I do with this info and how to see the actual request I am sending:

Did you configure for https OK.

The request header is being displayed in your screen shot (on the Headers tab). Other tabs will give you other views of the request. Looking at the response should also give you detail of the response.
You can filter which requests are shown to make it easier to identify those of interest.