import { ConnectionBackend, Connection } from '../interfaces';
import { ReadyState } from '../enums';
import { Request } from '../static_request';
import { Response } from '../static_response';
import { ResponseOptions } from '../base_response_options';
import { BrowserXhr } from './browser_xhr';
import { Observable } from 'rxjs/Observable';
/**
* Creates connections using `XMLHttpRequest`. Given a fully-qualified
* request, an `XHRConnection` will immediately create an `XMLHttpRequest` object and send the
* request.
*
* This class would typically not be created or interacted with directly inside applications, though
* the {@link MockConnection} may be interacted with in tests.
*/
export declare class XHRConnection implements Connection {
    request: Request;
    /**
     * Response {@link EventEmitter} which emits a single {@link Response} value on load event of
     * `XMLHttpRequest`.
     */
    response: Observable<Response>;
    readyState: ReadyState;
    constructor(req: Request, browserXHR: BrowserXhr, baseResponseOptions?: ResponseOptions);
}
/**
 * Creates {@link XHRConnection} instances.
 *
 * This class would typically not be used by end users, but could be
 * overridden if a different backend implementation should be used,
 * such as in a node backend.
 *
 * ### Example
 *
 * ```
 * import {Http, MyNodeBackend, HTTP_PROVIDERS, BaseRequestOptions} from 'angular2/http';
 * @Component({
 *   viewProviders: [
 *     HTTP_PROVIDERS,
 *     provide(Http, {useFactory: (backend, options) => {
 *       return new Http(backend, options);
 *     }, deps: [MyNodeBackend, BaseRequestOptions]})]
 * })
 * class MyComponent {
 *   constructor(http:Http) {
 *     http.request('people.json').subscribe(res => this.people = res.json());
 *   }
 * }
 * ```
 *
 **/
export declare class XHRBackend implements ConnectionBackend {
    private _browserXHR;
    private _baseResponseOptions;
    constructor(_browserXHR: BrowserXhr, _baseResponseOptions: ResponseOptions);
    createConnection(request: Request): XHRConnection;
}
