/**
 * -------------------------------------------------------------------------------------------
 * Copyright (c) Microsoft Corporation.  All Rights Reserved.  Licensed under the MIT License.
 * See License in the project root for license information.
 * -------------------------------------------------------------------------------------------
 */
/**
 * @module HTTPClient
 */
import { Context } from "./IContext";
import { Middleware } from "./middleware/IMiddleware";
/**
 * @class
 * Class representing HTTPClient
 */
export declare class HTTPClient {
    /**
     * @private
     * A member holding first middleware of the middleware chain
     */
    private middleware;
    /**
     * @public
     * @constructor
     * Creates an instance of a HTTPClient
     * @param {...Middleware} middleware - The first middleware of the middleware chain or a sequence of all the Middleware handlers
     */
    constructor(...middleware: Middleware[]);
    /**
     * @private
     * Processes the middleware parameter passed to set this.middleware property
     * The calling function should validate if middleware is not undefined or not empty.
     * @param {...Middleware} middleware - The middleware passed
     * @returns Nothing
     */
    private setMiddleware;
    /**
     * @private
     * Processes the middleware array to construct the chain
     * and sets this.middleware property to the first middleware handler of the array
     * The calling function should validate if middleware is not undefined or not empty
     * @param {Middleware[]} middlewareArray - The array of middleware handlers
     * @returns Nothing
     */
    private parseMiddleWareArray;
    /**
     * @public
     * @async
     * To send the request through the middleware chain
     * @param {Context} context - The context of a request
     * @returns A promise that resolves to the Context
     */
    sendRequest(context: Context): Promise<Context>;
}