我想部署一个flask应用程序，然后按照tutorial使用nginx完成此操作。

如本教程所述，我将执行以下操作：

sudo nano /etc/nginx/sites-available/app

此文件包含：

server {
    listen 80;
    server_name server_domain_or_IP;

    location / {
        include proxy_params;
        proxy_pass http://unix:/home/pi/Desktop/python_scripts/internetdisplay/app.sock;
    }
}

已创建系统单元服务，并且该服务成功运行。这在“ internetdisplay”目录中创建了app.sock文件。 Systemctl状态应用服务结果：

● app.service - Gunicorn instance to serve myproject
   Loaded: loaded (/etc/systemd/system/app.service; enabled; vendor preset: enabled)
   active: active (running) since Sun 2019-11-10 21:16:49 CET; 16h ago
 Main PID: 438 (gunicorn)
    Tasks: 4 (limit: 2200)
   Memory: 46.4M
   CGroup: /system.slice/app.service
           ├─438 /usr/bin/python2 /usr/bin/gunicorn --workers 3 --bind unix:app.sock -m 007 wsgi:app
           ├─679 /usr/bin/python2 /usr/bin/gunicorn --workers 3 --bind unix:app.sock -m 007 wsgi:app
           ├─681 /usr/bin/python2 /usr/bin/gunicorn --workers 3 --bind unix:app.sock -m 007 wsgi:app
           └─682 /usr/bin/python2 /usr/bin/gunicorn --workers 3 --bind unix:app.sock -m 007 wsgi:app

Nov 10 21:16:49 raspberrypi systemd[1]: Started Gunicorn instance to serve myproject.
Nov 10 21:16:57 raspberrypi gunicorn[438]: [2019-11-10 21:16:57 +0000] [438] [INFO] Starting gunicorn 19.9.0
Nov 10 21:16:57 raspberrypi gunicorn[438]: [2019-11-10 21:16:57 +0000] [438] [INFO] Listening at: unix:app.sock (438)
Nov 10 21:16:57 raspberrypi gunicorn[438]: [2019-11-10 21:16:57 +0000] [438] [INFO] Using worker: sync
Nov 10 21:16:57 raspberrypi gunicorn[438]: [2019-11-10 21:16:57 +0000] [679] [INFO] Booting worker with pid: 679
Nov 10 21:16:57 raspberrypi gunicorn[438]: [2019-11-10 21:16:57 +0000] [681] [INFO] Booting worker with pid: 681
Nov 10 21:16:57 raspberrypi gunicorn[438]: [2019-11-10 21:16:57 +0000] [682] [INFO] Booting worker with pid: 682

然后我链接到启用站点的并重新启动nginx：

    sudo ln -s /etc/nginx/sites-available/app /etc/nginx/sites-enabled
    sudo systemctl restart nginx

但是浏览到http://localhost会导致“无法访问此网站”错误