download the pdf through REST API process design call

Hi Team,

I have created process design that generate the pdf. The process design has 4 services

1- SetValue(execute)

2-ApplicationUtility(readApplicationAsset)

3-FormService(renderPDFForm)

4-OutputService(transformPDF)

When I am calling REST API (ex:) then the response Entity returning the url location where the pdf get stored temporarily not the actual pdf output. When I need the output pdf i need to call again the response entiry document url to get the pdf.

So, my question why we need to call 2 times to get the pdf. can we not download and save the pdf in one call