I am attempting to pull a range of cells from an excel spreadsheet in a SP 2013 doc library. The URI is as follows
https://<site>/_vti_bin/ExcelRest.aspx/<dir/filename>/Model/Ranges('Sheet1!E1%7CE100')
The URI produces clean results when entered into a browser address bar,including all variants (discovery, sheets, charts, formats). But when I use a SP 2013 workflow it always returns "Unauthorized" as the Response Code.
The workflow (calling HTTP GET) is in a list on the same site as the doc library, and other (HTTP POST) workflows from this same list have written plain text to the target doc library, so no auth issues in seemingly similar circumstances.
I tried creating a null "Authorization" string as part of the Request Headers dictionary variable, as advised by other experts on the web, however that has not made a change in the results. Also using "application/json;odata=verbose" for the "Content-Type" and "Accept" strings withing my Request Headers, but the presence or absence of those two strings has no effect either.
TIA for any advice.