Thanks for the link!   It successfully worked on the latest version of CSR1000v, that is, 'ios-xe-mgmt-latest.cisco.com". However, it is not working on the older version; "ios-xe-mgmt.cisco.com". (using the same credentials, headers, body, etc)   I ...

@bigevilbeard  Thank you for your prompt response! I was using  'ios-xe-mgmt.cisco.com' at first and tried using the alternative  'ios-xe-mgmt-latest.cisco.com .  When I changed the endpoint URI, it says that it could not send a response.  Do you hav...