Hello,
Currently, the print utility on ArcGIS Online (Task: Export Web Map Task ), will not be able to complete print requests when the request comes from an application (Web AppBuilder or otherwise) that is utilizing a proxy to circumvent the need to prompt for credentials.
I have spoken with personnel from Esri about this and there advise was to modify the Esri Resource Proxy to attach the token onto the "WebMap_as_JSON" request that is sent to the print service.
Could this be added to the proxy in future releases? Could the print service be modified to be "proxy aware"?
Thank you!
Chris
