title: nginx: [emerg] "proxy_buffers" directive invalid value in /etc/nginx/sites-enabled/
body: <p>I tried to restart nginx with command, but error occured.</p>
  <p><strong>When I run &quot;sudo systemctl restart nginx&quot;, this happens.</strong></p>
  <p>Job for nginx.service failed because the control process exited with error code. See &quot;systemctl status nginx.service&quot; and &quot;journalctl -xe&quot; for details.</p>
  <p><strong>When I run &quot;systemctl status nginx.service&quot;, this happens.</strong></p>
  <p>Mar 30 08:55:04 ip-172-31-22-186 nginx[2624]: nginx: [emerg] &quot;<strong>proxy_buffers</strong>&quot; directive invalid value in /etc/nginx/sites-enabled/...:19
  Mar 30 08:55:04 ip-172-31-22-186 nginx[2624]: nginx: configuration file /etc/nginx/nginx.conf test failed</p>
  <p><strong>in nginx.conf file:</strong></p>
  <pre><code>   location / {
              ....
              proxy_buffer_size 0M;
              proxy_buffers 4 0M;
              proxy_busy_buffers_size 0M;
              client_max_body_size 0M;
      }
  </code></pre>
  <p>is there a problem with the configuration here?</p>