import { Injector, InjectionToken } from '@angular/core';
import { HttpHandler, HttpRequest, HttpEvent, HttpInterceptor, HttpHeaders } from '@angular/common/http';
import { Observable } from 'rxjs';
import { ApiAuthorizationHeaderInterceptor } from '../interceptors/api-authorization-header/api-authorization-header.interceptor';
export declare class ApiHttpHandlerService implements HttpHandler {
    protected backend: HttpHandler;
    protected injector: Injector;
    protected apiHttpInterceptorsInjectionToken: InjectionToken<HttpInterceptor[]>;
    protected chain: HttpHandler | null;
    protected apiAuthorizationInterceptor: ApiAuthorizationHeaderInterceptor | null;
    constructor(backend: HttpHandler, injector: Injector, apiHttpInterceptorsInjectionToken: InjectionToken<HttpInterceptor[]>);
    handle(req: HttpRequest<any>): Observable<HttpEvent<any>>;
    /**
     * @experimental the headersWithNoAuthorization support is experimental
     * see {@link ApiAuthorizationHeaderInterceptor#headersWithNoAuthorization} for details
     */
    headersWithNoAuthorization(headers?: HttpHeaders | string | {
        [name: string]: string | string[];
    }): HttpHeaders;
}