How do I access this api?

doc: https://predbdotovh.github.io/pre-api/#endpoints

api: https://predb.ovh/api/v1/ws

axios.get('https://predb.ovh/api/v1/ws').then(function(response) {
    console.log('success');
    console.log(response);
}).catch(function(error) {
    console.log('error');
    console.log(error);
});

I get status code 400. Is this the right way to do http request?