@Override
  public JsonRpcResponse response(final JsonRpcRequestContext requestContext) {
    return new JsonRpcSuccessResponse(requestContext.getRequest().getId(), networkId);
  }
In ConsenSys' client, net_version maps to the network id, as specified in *
https://github.com/ethereum/wiki/wiki/JSON-RPC#net_version

<p>This method can be deprecated in the future, @see https://github.com/ethereum/EIPs/issues/611
ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/NetVersion.java