@Override
  public void handleLogin(final RoutingContext routingContext) {
    if (credentialAuthProvider.isPresent()) {
      login(routingContext, credentialAuthProvider.get());
    } else {
      handleDisabledLogin(routingContext);
    }
  }
Handles a login request and checks the provided credentials against our credential auth
provider

@param routingContext Routing context associated with this request
ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/authentication/DefaultAuthenticationService.java