We are trying to use the APIs from WebReportDesignerController, but it seems that this requires the instanceId be passed in the header. Is there an option to access the APIs with out instanceId? If not how can we create one and access the APIs.
Unfortunately, we are not quite sure what you are trying to achieve with the process you have described. Could you please explain?
We would like to understand why you need this requirement or what you want to use it for.
As far as Web Report Designer is concerned, the correct procedure would be to use the WRD tag.
You can also find more information about how to use Web Report Designer in our forum.