* Enable the `clique` option in the `--http.api` flag.
* List of Clique commands:
`clique_getSnapshot(block number)`
`clique_getSnapshotAtHash(block hash)`
`clique_getSnapshotAtHash(block hash)`
`clique_getSigners(block number)`
`clique_getSignersAtHash(block hash)`
`clique_proposals()`
`clique_propose(signer address, bool)`
`clique_discard(signer address)`
`clique_status()`
Example:
`curl --data
'{"method":"clique_getSigners","params":[],"id":1,"jsonrpc":"2.0"}' -H
"Content-Type: application/json" -X POST http://localhost:8545`
* Please be careful while using the Clique API. Do not make the HTTP API
public on the Clique's signer node, as anyone can directly call a Clique
command. Instead, it should only be allowed in the localhost by using
the flag `--http.addr "127.0.0.1"`.
