$ sudo apt-get update
$ sudo apt-get install libhttpcore-java 

libhttpcore-java is installed in your system.

Make ensure the libhttpcore-java package were installed using the commands given below,

$ sudo dpkg-query -l | grep libhttpcore-java *

You will get with libhttpcore-java package name, version, architecture and description in a table

libhttpcore-java package basic information: