Hi Rodrigo,
Thanks for contacting Syncfusion support.
Query : “We would like to know if it's possible to perform requisitions with headers additions using ej.DataManager”
Yes it is possible add custom headers in ej.DataManager using headers property. For more information, refer the below help document.
Query : “Our goal at the beginning is to avoid bringing all records in one go, just get few records on the first page and when we call the next page (next or previous), we ask for a corresponding new range for the page”
According to your query we suspect that you are expecting loadOnDemand concept in Grid. This concept can be achieved using the adaptors of the DataManager. Using the URLAdaptor, Grid collects the data (need for current page) from the server and updated in Grid. So, only the current page of cells will be rendered in DOM Elements.
Refer to the Help document for the Url Adaptor.
Regards,
Prasanna Kumar N.S.V