public static String checkLogin(Userinfo ui) {
Client client = ClientBuilder.newClient(config);
WebTarget target = client.target(getBaseUri());
return target
.path("users")
.path("role=" + ui.getUsertype())
.path("email=" + ui.getUsername())
.path("password=" + ui.getPassword())
.request()
.accept(MediaType.TEXT_HTML)
.get(String.class);
}