Hijk is a specialized http client that does nothing but transport the response body back. it does not feature as a "user agent", but as a dumb client. it is suitable for connecting to data servers transporting via http rather then web servers.

most of http features like proxy, redirect, transfer-encoding, or ssl are not supported at all. for those requirements there already are many good http clients like http::tiny, furl or lwp::useragent.