/**
 * Copyright (c) 2014 Baidu.com, Inc. All Rights Reserved
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * @file src/http_client.ts
 * @author leeight
 */
import { Readable, Writable } from 'stream';
import { EventEmitter } from 'events';
import type { BceConfig, Credentials, HttpMethod, HttpHeaders, BceResponse } from './types/common';
/** 签名计算函数类型 */
export type SignatureFunction = (credentials: Credentials, httpMethod: HttpMethod, path: string, params: Record<string, any>, headers: HttpHeaders, context: HttpClient) => string | Promise<string> | Promise<{
    authorization: string;
    xbceDate?: string;
}>;
/** HTTP 请求体类型 */
export type RequestBody = string | Buffer | Readable | Blob | ArrayBuffer | FormData | null | undefined;
/**
 * HTTP 客户端类
 *
 * @example
 * ```typescript
 * const client = new HttpClient({
 *   endpoint: 'https://bj.bcebos.com',
 *   credentials: { ak: 'your-ak', sk: 'your-sk' }
 * });
 *
 * const response = await client.sendRequest('GET', '/path', null, {}, {});
 * ```
 */
export declare class HttpClient extends EventEmitter {
    /** 配置对象 */
    config: BceConfig;
    /** HTTP(S) 请求对象 */
    private _req;
    /**
     * 构造函数
     * @param config HTTP 客户端配置
     */
    constructor(config: BceConfig);
    /**
     * 基于对象路径更新配置参数值
     * @param path 配置路径，用点分隔
     * @param value 新的值
     * @returns 更新后的配置对象
     */
    updateConfigByPath(path: string, value: any): BceConfig;
    /**
     * 发送 HTTP 请求
     * @param httpMethod HTTP 方法
     * @param path 请求路径
     * @param body 请求体
     * @param headers 请求头
     * @param params 查询参数
     * @param signFunction 签名函数
     * @param outputStream 输出流
     * @returns Promise<BceResponse>
     */
    sendRequest(httpMethod: HttpMethod, path: string, body?: RequestBody, headers?: HttpHeaders, params?: Record<string, any>, signFunction?: SignatureFunction, outputStream?: Writable): Promise<BceResponse>;
    /**
     * 执行 HTTP 请求
     * @param options 请求选项
     * @param body 请求体
     * @param outputStream 输出流
     * @returns Promise<BceResponse>
     */
    private _doRequest;
    /**
     * 猜测内容长度
     * @param data 数据
     * @returns 内容长度
     */
    private _guessContentLength;
    /**
     * 修复响应头部
     * @param headers 原始头部
     * @returns 修复后的头部
     */
    private _fixHeaders;
    /**
     * 接收响应数据
     * @param res 响应对象
     * @returns Promise<BceResponse>
     */
    private _recvResponse;
    /**
     * 发送请求数据
     * @param req 请求对象
     * @param data 数据
     */
    private _sendRequest;
    /**
     * 构建查询字符串
     * @param params 参数对象
     * @returns 查询字符串
     */
    buildQueryString(params?: Record<string, any>): string;
    /**
     * 获取请求 URL
     * @param path 路径
     * @param params 参数
     * @returns 完整的请求 URL
     */
    private _getRequestUrl;
    /**
     * 创建成功响应
     * @param httpHeaders HTTP 头部
     * @param body 响应体
     * @returns 成功响应对象
     */
    private _createSuccessResponse;
    /**
     * 创建失败响应
     * @param statusCode 状态码
     * @param message 错误消息
     * @param code 错误代码
     * @param requestId 请求 ID
     * @param xBceDate BCE 日期
     * @returns 失败响应对象
     */
    private _createFailureResponse;
    /**
     * 检查是否为 Promise
     * @param obj 对象
     * @returns 是否为 Promise
     */
    private _isPromise;
    /**
     * 检查是否为 XHR2 兼容对象
     * @param obj 对象
     * @returns 是否兼容
     */
    private _isXHR2Compatible;
}
export default HttpClient;
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