The URL the request ended on: the last redirect target, or the requested URL when
there was none. Relative links inside the body are resolved against this, as RFC
3986 §5.1.3 requires — a server that redirects /oparl to /v1/system and then
hands out "body": "bodies" means /v1/bodies.
The decoded body.
A decoded JSON response together with the URL it was finally read from.