Configure HTTP Strict Transport Security

HTTP Strict Transport Security (HSTS) a simple and widely-supported standard to protect visitors by ensuring that their browsers always connect to a website over HTTPS.

To configure HSTS:

Open the <Tomcat>/conf/web.xml file in a text editor.
Remove the following:
- httpHeaderSecurity filter definition
- <filter-mapping> section

Add the hstsMaxAgeSeconds parameter.

<filter>
    <filter-name>httpHeaderSecurity</filter-name>
  <filter-class>org.apache.catalina.filters.HttpHeaderSecurityFilter</filter-class>
    <init-param>
      <param-name>hstsMaxAgeSeconds</param-name>
      <param-value>31536000</param-value>
    </init-param>
    <async-supported>true</async-supported>
</filter>
<filter-mapping>
    <filter-name>httpHeaderSecurity</filter-name>
    <url-pattern>/*</url-pattern>
    <dispatcher>REQUEST</dispatcher>
</filter-mapping>

Save changes.
Restart Tomcat.