HTTP request canceled

I am using the following code to do a POST request to https://streams.adobeprimetime.com/v2/sessions/xx/xxxxxxx, but got -10001 code and `cancelled` error message.
Any idea what may be wrong?

   request = createObject("roUrlTransfer")
   request.setCertificatesFile("common:/certs/ca-bundle.crt")
   request.initClientCertificates()
   request.enablePeerVerification(false)
   request.enableHostVerification(false)