Book: Developing webservices applications
Chapter: 2.2.2. Implementing RESTEasy with HTTP Client [1]

There was fix for this chapter [2] in upstream documentation, in correcting the name of the default implementation class. Please backport that fix.

[1] https://doc-stage.usersys.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.1.beta/single/developing_web_services_applications/#how_to_use_resteasy_with_closeable_apache_http_client
[2] https://issues.jboss.org/browse/RESTEASY-1690