The fix to CONTROLLER-477 introduced URI parameter prettyPrint. The code from https://git.opendaylight.org/gerrit/#/c/8329 is still there, but since then codecs were moved to yangtools, and logic to detect prettyPrint was not moved properly. This example from gerrit (with new restconf port) thus now fails to result in formatted output:
http://localhost:8181/restconf/config/opendaylight-inventory:nodes?prettyPrint=true