import { HttpClient, HttpErrorResponse, HttpHeaders, HttpParams } from '@angular/common/http';
import { Observable } from 'rxjs';
import { CommonImage } from '../models/images.model';
/**
 * Abstract class for HTTP Service
 */
export declare abstract class AbstractHttpService {
    protected http: HttpClient;
    protected logHTTPRequestsToConsole: boolean;
    constructor(http: HttpClient);
    /** The headers to send along with every GET and POST. */
    protected abstract _headers: HttpHeaders;
    /**
     * Makes a GET request to the specified URL, using headers and HTTP options specified in their respective methods.
     * @param url Target URL to make the GET request
     */
    protected get<T>(url: any, queryParams?: HttpParams): Observable<T>;
    protected post<T>(url: any, body: any): Observable<T>;
    protected setupRequest<T>(observable: Observable<any>): Observable<T>;
    /** The HttpOptions object that Angular takes for GET and POST requests. Used in every HTTP request from this service. */
    protected readonly httpOptions: {
        headers: HttpHeaders;
        params?: HttpParams;
    };
    /** Handles all failed requests that throw either a server error (400/500) or a client error (e.g. lost internet). */
    protected abstract handleError(error: HttpErrorResponse): any;
    protected generateUUID(): string;
    /**
     * Uploads an individual attachment.  All you need to do is set the url.
     * Note: urls often include UUIDs, so this must be an application decision.
     *
     * @param relativeUrl URL to hit, must include UUIDs of application and CommonImage
     * @param attachment CommonImage to upload
     */
    protected uploadAttachment(relativeUrl: string, attachment: CommonImage): Observable<string>;
}