I believe in jackrabbit-standalone jar, there should be an application server embedded in order to serve web content.
I was trying to find what is the exact embedded server used in jackrabbit-standalone.jar. Based on the documentation on jackrabbit-standalone it does not mention any thing about it.
https://jackrabbit.apache.org/jcr/standalone-server.html
Do any one know about which embedded server it uses?
It makes use of eclipse jetty.
You can validate it by digging on project's source code and especially jackrabbit-standalone module.
Snippet from pom.xml of aforesaid module:
Snippet from org.apache.jackrabbit.standalone.Main: