Applies to ONTAP System Manager, OnCommand System Manager Google Chrome Mozilla Firefox Description A common way to review issues seen on the UI of ONTAP System Manager requires studying the API heade...Applies to ONTAP System Manager, OnCommand System Manager Google Chrome Mozilla Firefox Description A common way to review issues seen on the UI of ONTAP System Manager requires studying the API headers and responses between the cluster web application and the browser. Note: ONTAP System manager (New Experience || SM.NEXT) . Uses REST API calls, with JSON formatted responses. OnCommand System manager (Classical). Uses Zephyr API (ZAPI) calls, with XML formatted responses.