If you are trying to embed Jenkins page in another page then you might get following exception:
Refused to display http://localhost:8080/jenkins in a frame because it set ‘X-Frame-Options’ to ‘SAMEORIGIN’
If you are facing the same problem as me then you can fix it restarting the Jenkins setting the system property -Djenkins.security.FrameOptionsPageDecorator.enabled as false from Jenkins 1.581, as follows:
java -Djenkins.security.FrameOptionsPageDecorator.enabled=false -jar jenkins.war
Along with setting the ALLOW-FROM uri in a page where you want to embed Jenkins page.