Load data from DB

Hello! When I try to load data used http services, always need to do other action before my data load, never load automatically, for example my service is


listAll(): Observable {
return this.http.get(this.variables.getServiceEndpoint() + '/clients/all/', {})
.pipe(catchError(err => {
this.notAllowed(err);
return throwError(err);
}
)
);


In my OnInit have that code


this.service.listAll()
.subscribe(i => {
this.clients = i as Clients[];
});


and in my table use this information

but never load alone, always need to click any bottom, for load

Can help me?

Thanks