Protocol is currently under development in https://github.com/libp2p/go-libp2p-circuit/pull/125/. _Adding this issue to be able to track all outstanding specifications via [this query](https://github.com/search?q=add+spec+in%3Atitle+is%3Aopen+repo%3Alibp2p%2Fspecs&type=Issues&ref=advsearch&l=&l=)._
Protocol is currently under development in libp2p/go-libp2p-circuit#125.
Adding this issue to be able to track all outstanding specifications via this query.