Latest version of com.typesafe.akka:akka-http-spray-json-experimental_2.11
https://javadoc.io/doc/com.typesafe.akka/akka-http-spray-json-experimental_2.11
Current version 2.4.9-RC1
https://javadoc.io/doc/com.typesafe.akka/akka-http-spray-json-experimental_2.11/2.4.9-RC1
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/com.typesafe.akka/akka-http-spray-json-experimental_2.11/2.4.9-RC1/package-list