Django下载文件名称不显示，中文乱码问题

遇到名称不显示，乱码，无后缀等问题，多半是编码和解码不对产生的。

 

def read_file(file_name, size):
    with open(file_name, mode='rb') as fp:
        while True:
            c = fp.read(size)
            if c:
                yield c
            else:
                break

from django.shortcuts import get_object_or_404
from django.http import StreamingHttpResponse
import os
 
def getDoc(request, id):
    doc = get_object_or_404(Doc, id=id)
    update_to, filename = str(doc.file).split('/')
    filepath = '%s/media/%s/%s' % (os.getcwd(), update_to, filename)
    response = StreamingHttpResponse(read_file(filepath, 512))
    response['Content-Type'] = 'application/octet-stream'
    response['Content-Disposition'] = 'attachment;filename="{}"'.format(filename.encode('utf-8').decode('ISO-8859-1'))
    return response

.format(filename.encode('utf-8').decode('ISO-8859-1'))

亏我找了那么久，原来就差这几个字。