/**
 * HTTP Client - 统一HTTP客户端
 *
 * 提供统一的HTTP请求处理功能
 */
/**
 * HTTP请求配置
 */
export interface HttpRequestConfig {
    method: 'GET' | 'POST' | 'PUT' | 'DELETE' | 'PATCH';
    headers?: Record<string, string>;
    timeout?: number;
    maxRetries?: number;
    retryDelay?: number;
    signal?: AbortSignal;
}
/**
 * HTTP响应
 */
export interface HttpResponse {
    data: unknown;
    status: number;
    statusText: string;
    headers: Record<string, string>;
    url: string;
}
/**
 * HTTP客户端配置
 */
export interface HttpClientConfig {
    baseUrl?: string;
    timeout?: number;
    maxRetries?: number;
    retryDelay?: number;
    defaultHeaders?: Record<string, string>;
    /**
     * Stream idle timeout (ms) after response headers are received.
     * When upstream stream produces no bytes for this long, abort.
     */
    streamIdleTimeoutMs?: number;
    /**
     * Stream headers timeout (ms) before the initial response headers are received.
     */
    streamHeadersTimeoutMs?: number;
}
export declare class HttpClient {
    private config;
    private defaultConfig;
    constructor(config?: HttpClientConfig);
    /**
     * 发送GET请求
     */
    get(url: string, headers?: Record<string, string>): Promise<HttpResponse>;
    /**
     * 发送POST请求
     */
    post(url: string, data?: unknown, headers?: Record<string, string>, signal?: AbortSignal): Promise<HttpResponse>;
    /**
     * 发送POST请求并返回可读流（适用于 SSE ）
     */
    postStream(url: string, data?: unknown, headers?: Record<string, string>, streamConfig?: {
        timeoutMs?: number;
        idleTimeoutMs?: number;
        headersTimeoutMs?: number;
    }, signal?: AbortSignal): Promise<NodeJS.ReadableStream>;
    private wrapStreamWithTimeouts;
    /**
     * 发送PUT请求
     */
    put(url: string, data?: unknown, headers?: Record<string, string>, signal?: AbortSignal): Promise<HttpResponse>;
    /**
     * 发送DELETE请求
     */
    delete(url: string, headers?: Record<string, string>, signal?: AbortSignal): Promise<HttpResponse>;
    /**
     * 发送PATCH请求
     */
    patch(url: string, data?: unknown, headers?: Record<string, string>, signal?: AbortSignal): Promise<HttpResponse>;
    /**
     * 通用请求方法
     */
    private request;
    /**
     * 发送单个请求
     */
    private sendSingleRequest;
    private attachExternalAbortSignal;
    /**
     * 为 HTTP 错误构造截断后的错误消息，避免在控制台打印过长的上游返回体。
     * 完整 body 仍通过 err.response.raw 保留在错误详情中。
     */
    private buildHttpErrorMessage;
    /**
     * 构建完整URL
     */
    private buildUrl;
    /**
     * 构建请求头
     */
    private buildHeaders;
    /**
     * 判断是否应该重试
     */
    private shouldRetry;
    /**
     * 创建Provider错误
     */
    private createProviderError;
}