Please add this in web.xml (under webapps/flexdeploy/WEB-INF)
<filter> <filter-name>httpHeaderSecurity</filter-name> <filter-class>org.apache.catalina.filters.HttpHeaderSecurityFilter</filter-class> <async-supported>true</async-supported> <init-param> <param-name>hstsEnabled</param-name> <param-value>true</param-value> </init-param> <init-param> <param-name>hstsMaxAgeSeconds</param-name> <param-value>31536000</param-value> </init-param> <init-param> <param-name>hstsIncludeSubDomains</param-name> <param-value>true</param-value> </init-param> <init-param> <param-name>antiClickJackingOption</param-name> <param-value>SAMEORIGIN</param-value> </init-param> </filter>
Now this filter-mapping should be added as first filter-mapping in this file.
<filter-mapping> <filter-name>httpHeaderSecurity</filter-name> <url-pattern>/*</url-pattern> <dispatcher>REQUEST</dispatcher> </filter-mapping>