Nodeclipse — REST client tool
REST client tool is REST plugin for Eclipse that also let’s you see low level HTTP packet internals (raw client request and server response).
It was created by Yadu Vendra (blog) in 2010. Sources converted to git are at https://github.com/Nodeclipse/restclient-tool.
This plugin in distributed within Nodeclispe NTS, Enide Studio and Enide Monst(e)r.
You can install plugin from http://www.nodeclipse.org/updates/
It is inside “Enide Tools Collection” group.
UPDATE Nov 2017
Try similar, but more advanced http4e
https://github.com/nextinterfaces/http4e