Reduce download size by central setting omit null values in HTTP Prefer header

[guido_leenders]

The OData4 standard allows null values to be omitted. However, this HTTP Header is not set by default. We must train every user (thousands of companies) to change the OData.Feed everywhere.

It would be great when the HTTP Prefer header would be set always or when that could be configured centrally.

[guido_leenders]

Download size reduction varies. On Twinfield and other XML-based sources we see reduction up to 99%, on REST-based sources typically 10-50%.