C# HttpGet response gives me an empty Excel file with EPPlus
问题 I've created an endpoint that generates an Excel file. It's supposed to function as a GET in case I want some other code to POST it to a different endpoint for emailing, or in case I want to just download the Excel file by hitting the endpoint manually in a browser. It's downloading the Excel file, but when I try to open it I see the message "Excel cannot open the file 'blahblah' because the file format or file extension is not valid. Verify that the file has not been corrupted and that the