>>You can see the exact response using Telnet (download PuTTY if you don't have a telnet client):
>>

C:\> telnet yourweburl.com 80

>>
>>Type "GET / HTTP/1.1" or whatever the url is producing the error, and press enter twice. Look at the top line of the header returned. That's what you'd need to parse if you can get the raw returned content, including that header.
>>
>Or you can just use postman or fiddler …

I'd never heard of them before. Thank you for teaching me something new, John.