location / {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host            $host;
    proxy_set_header X-Real-IP       $remote_addr;
    # https://github.com/http-rs/tide/issues/458#issuecomment-619243201
    proxy_http_version 1.1;

    proxy_pass http://dotdotvote;
  }

最重要是那一行proxy_http_version 1.1;并且proxy_pass 放到最后一行