要触发下载，你需要设置Content-Disposition标题：

from django.http import HttpResponse
from wsgiref.util import FileWrapper

# generate the file
response = HttpResponse(FileWrapper(myfile.getvalue()), content_type='application/zip')
response['Content-Disposition'] = 'attachment; filename=myfile.zip'
return response

如果你不想将文件放在磁盘上，则需要使用 StringIO

import cStringIO as StringIO

myfile = StringIO.StringIO()
while not_finished:
    # generate chunk
    myfile.write(chunk)

你也可以选择设置Content-Length标头：

response['Content-Length'] = myfile.tell()