Latest version of io.netty:netty-all
https://javadoc.io/doc/io.netty/netty-all
Current version 4.1.21.Final
https://javadoc.io/doc/io.netty/netty-all/4.1.21.Final
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/io.netty/netty-all/4.1.21.Final/package-list