How to call a servlet doPost from a UI5 app - and also pass a string parameter.

Hi,

We are trying to develop a SF extension application which will retrieve employee information of certain kind (in XML format) and convert it into PDF format.

We do have the UI5 app ready - which retrieves the employee data from SF. We also have the servlet PDF conversion program ready. What we do not know is how to pass the data from the first app to the second servlet.

Can anyone please help?