Just want to report an error with regards to sending an XML file through an HTTP POST trigger. We were getting an xml error whenever we are using the POST trigger and found out that only the HTML headers are being sent out by the trigger but not the XML file itself. We've actually confirmed that our target URL and XML are working but once we use it in RB we always get an error. Kindly see the screenshot of the trigger and the response as well.
Since you have enabled chunked transfer, remove Content-Length header. Looks like Server si reading only 3000 bytes from POST body and this results in malformed XML.