如何在fastapi StreamingResponse中从内存返回文件？

Question

我想根据要求提供 xlsx。通过使用BytesIO，xlsxwriter我创建了一个文件。

使用下面的代码，我可以下载一个空（！）.txt文件：

@router.get("/payments/xlsx", response_description='xlsx')
async def payments():
    """sss"""
    output = BytesIO()
    workbook = xlsxwriter.Workbook(output)
    worksheet = workbook.add_worksheet()
    worksheet.write(0, 0, 'ISBN')
    worksheet.write(0, 1, 'Name')
    worksheet.write(0, 2, 'Takedown date')
    worksheet.write(0, 3, 'Last updated')
    workbook.close()
    output.seek(0)
    return StreamingResponse(output)

如果我添加，headers={'Content-Type': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'}我会在浏览器中收到此错误：

Unable to open file
You may be having a problem connecting with the server, or the file that you wanted to open was corrupted.

我该如何解决这个问题？

Answer 1

您必须Content-Disposition在响应中设置标头

@router.get("/payments/xlsx", response_description='xlsx')
async def payments():
    output = BytesIO()
    workbook = xlsxwriter.Workbook(output)
    worksheet = workbook.add_worksheet()
    worksheet.write(0, 0, 'ISBN')
    worksheet.write(0, 1, 'Name')
    worksheet.write(0, 2, 'Takedown date')
    worksheet.write(0, 3, 'Last updated')
    workbook.close()
    output.seek(0)

    headers = {
        'Content-Disposition': 'attachment; filename="filename.xlsx"'
    }
    return StreamingResponse(output, headers=headers)