curl --request POST \
  --url https://rpc.mainnet.near.org/health \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": "<string>",
  "jsonrpc": "<string>",
  "method": "health",
  "params": null
}
'

{
  "result": null,
  "id": "<string>",
  "jsonrpc": "<string>"
}