python – Nginx早期切断静态文件下载

我有一个Flask应用程序,通过x-accel-redirect将应该提供静态文件的请求重定向到NGINX.有时,这些下载将在完成之前被切断.例如,通过cURL,我会看到：

curl http://my_server/some_static_file.tar > temp.tar
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
 77 14.4G   77 11.2G    0     0  55.8M      0  0:04:24  0:03:25  0:00:59 58.9M
curl: (18) transfer closed with 3449105332 bytes remaining to read

这似乎更常见于非常大的文件(10gb),但我已经看到它也发生在~90mb的较小文件上. Nginx访问日志显示来自和提供不同,不完整数据量的请求：

1.2.3.4 - - [18/Apr/2017:01:16:26 +0000] "GET /some/flask/static/file/path HTTP/1.1" 200 15146008576 "-" "curl/7.38.0" "5.6.7.8"
1.2.3.5 - - [18/Apr/2017:01:16:29 +0000] "GET /some/flask/static/file/path HTTP/1.1" 200 15441739776 "-" "curl/7.38.0" "6.7.8.9"

errors.log没什么用处.

我的相关烧瓶配置如下：

response = make_response('')
response.headers.set('X-Accel-Redirect','/_special_nginx_path/' + file_name)
response.headers.set('Content-Disposition','attachment',filename=file_name)
# have tried both with and without setting content-length
response.headers.set('Content-Length',os.path.getsize(file_path))
try:
    response.mimetype = mimetypes.guess_type(file_name)[0]
    if not response.mimetype:
        response.mimetype = 'application/octet-stream'
except AttributeError:
    response.mimetype = 'application/octet-stream'
return response

我的相关NGINX配置如下(运行我的烧瓶应用程序的uWSGI服务器运行在127.0.0.1:1234)：

location / {
            proxy_pass http://127.0.0.1:1234;
            proxy_redirect off;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }



location /_special_nginx_path {
           internal;
           alias /path/to/static/files;
    }