import { Http, RequestOptions, Response } from '@angular/http';
import { AuthenticationService } from 'ngx-login-client';
import { Observable } from 'rxjs/Observable';
/**
 * This class is an abstract of Angular2 HTTP
 * Extended from Angular2 HTTP
 *
 * Purpose:
 * Error handling on API services
 * To implement a general retry logic
 */
export declare class HttpService extends Http {
    private headers;
    constructor(backend: any, options: RequestOptions, auth: AuthenticationService);
    private setHeaders(options);
    get(url: string, options?: {}): Observable<Response>;
    post(url: string, body: any, options?: {}): Observable<Response>;
    put(url: string, body: any, options?: {}): Observable<Response>;
    patch(url: string, body: any, options?: {}): Observable<Response>;
    delete(url: string, options?: {}): Observable<Response>;
}