Docker Nginx反向代理支持websocket

upstream rancher {
  server rancher:80;
  server rancher:443;
}
server {
  listen 80;
  listen 443 ssl http2;
  ssl_certificate /usr/local/nginx/conf/ssl/rancher.akiraka.com.pem;
  ssl_certificate_key /usr/local/nginx/conf/ssl/rancher.akiraka.com.key;
  ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
  ssl_ciphers EECDH+CHACHA20:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:EECDH+3DES:RSA+3DES:!MD5;
  ssl_prefer_server_ciphers on;
  ssl_session_timeout 10m;
  ssl_session_cache builtin:1000 shared:SSL:10m;
  ssl_buffer_size 1400;
  add_header Strict-Transport-Security max-age=15768000;
  ssl_stapling on;
  ssl_stapling_verify on;
  server_name rancher.akiraka.net;
  if ($ssl_protocol = "") { return 301 https://$host$request_uri; }

  location / {
    proxy_pass https://rancher;
    proxy_http_version 1.1;
    proxy_set_header Host $http_host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    # 启用支持websocket连接
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
  }
}