这个Nginxconfiguration有多安全？ 我还有什么可以做进一步优化？

所以我最近设置了一个个人的GitLab服务器，我正在使用完整SSL的以下configuration。 我尽我所能，但还有什么可以做得更好？ 我大部分时间都是通过闲暇时间了解我对networking服务器的了解，所以我没有真正遵循任何规范。 请让我知道任何意见和疑虑。

server_tokens off; add_header X-Frame-Options SAMEORIGIN; add_header X-Content-Type-Options nosniff; add_header X-XSS-Protection "1; mode=block"; add_header Content-Security-Policy "default-src 'self'; script-src 'self''unsafe-inline' 'unsafe-eval' https://ssl.google-analytics.com h https://assets.zendesk.com https://connect.facebook.net; img-src 'self' https://ssl.google-analytics.com https://s-static.ak.facebook.com https://assets.zendesk.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com https://assets.zendesk.com; font-src 'self' https://themes.googleusercontent.com; frame-src https://assets.zendesk.com https://www.facebook.com https://s-static.ak.facebook.com https://tautt.zendesk.com; object-src 'none'"; server { listen 80; listen 443 default ssl spdy; server_name gitlab.example.com; add_header Strict-Transport-Security "max-age=31536000; includeSubdomains"; ssl_certificate /etc/nginx/ssl/gitlab.crt; ssl_certificate_key /etc/nginx/ssl/gitlab.key; ssl_dhparam /etc/nginx/ssl/dhparams.pem; ssl_session_cache shared:SSL:50m; ssl_session_timeout 5m; ssl_prefer_server_ciphers on; ssl_protocols TLSv1 TLSv1.1 TLSv1.2; ssl_stapling on; ssl_stapling_verify on; ssl_trusted_certificate /etc/nginx/ssl/CA/comodo.pem; resolver 8.8.8.8; ssl_ciphers "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!3DES:!MD5:!PSK"; location / { proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-Ssl on; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header X-Frame-Options SAMEORIGIN; proxy_pass http://192.168.1.139:82; proxy_redirect http://192.168.1.139:82 https://gitlab.example.com; } }