【求助】第一次处理上传文件；diydjango上传的文件，格式错误

Question

通过django上传的文件，始终格式错误。图片打不开
class FileUploadView(APIView):

parser_classes = (FileUploadParser,)

def post(self, request, filename, format=None):
    print filename
    file_obj = request.data['file']
    file_dest = join(MEDIA_ROOT,'pic',filename)
    print file_obj.multiple_chunks()
    with open(file_dest,'w') as f:
        for chunk in file_obj.chunks():
            f.write(chunk)
    # ...
    # do some stuff with uploaded file
    # ...
    return Response(status=204)
    

红框里是原始内容，

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图片如下：