红帽全球峰会7.2.5. HTTP Strict Transport Security (HSTS)
HTTP 严格传输安全性(HSTS)可防止浏览器在最初进行安全连接后进行后续的不安全连接。如果您在公共或不可信区中部署了 HTTP 服务，HSTS 特别重要。
对于基于 director 的部署，默认启用此设置：
enable_secure_proxy_ssl_header: true
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