public class SubscriberContactController {
    public Contact contact { get; set; }

    public SubscriberContactController() {
        HttpRequest req = new HttpRequest();
        req.setEndpoint('http://yourwebsite.com/api/contact'); // replace with your API endpoint
        req.setMethod('GET');

        Http http = new Http();
        HttpResponse res = http.send(req);

        // Parse thee JSON response
        if (res.getStatusCode() == 200) {
            Map<String, Object> data = (Map<String, Object>) JSON.deserializeUntyped(res.getBody());
            this.contact = new Contact();
            this.contact.LastName = (String) data.get('fullName');
            this.contact.Email = (String) data.get('email');
            this.contact.Phone = (String) data.get('phone');
            this.contact.Website__c = (String) data.get('website');
            this.contact.Description = (String) data.get('message');
        }
    }

}