/// <reference types="node" />
/// <reference types="cheerio" />
import { Stream } from "stream";
import { IncomingHttpHeaders } from "http";
import { AxiosResponse, Method } from "axios";
import download from "download";
import { Crawler } from "./crawler";
export declare type JSONPrimitive = string | number | boolean | null;
export declare type JSONObject = {
    [key: string]: JSONValue;
};
export interface JSONArray extends Array<JSONValue> {
}
export declare type JSONValue = JSONPrimitive | JSONObject | JSONArray;
export { Method };
export interface DownloadBody {
    filepath: string;
    options: download.DownloadOptions;
}
export declare type Body = string | JSONValue | DownloadBody | Buffer | ArrayBuffer | ArrayBufferView | Uint8Array | URLSearchParams | Stream | null;
export declare type HTTPHeaders = IncomingHttpHeaders;
export interface UrlCustomer {
    url: string;
    method?: Method;
    body?: Body;
    headers?: HTTPHeaders;
}
export declare type Url = string | UrlCustomer;
export interface Response extends AxiosResponse, CheerioSelector, CheerioAPI {
    /**
     * The crawler instance.
     */
    crawler: Crawler;
    /**
     * How many times(ms) it takes.
     */
    times: number;
    /**
     * Download the resource
     * @param url The resource url
     * @param filepath The filepath which is the resource downloaded
     * @param options
     */
    download(url: string, filepath: string, options?: download.DownloadOptions): Promise<void>;
    /**
     * Download the resource in queue
     * @param url The resource url
     * @param filepath The filepath which is the resource downloaded
     * @param options
     */
    downloadInQueue(url: string, filepath: string, options?: download.DownloadOptions): void;
    /**
     * Go to the next url
     * @param Url
     */
    follow(url: Url): void;
    /**
     * retry again. There may be duplicate data.
     */
    retry(): void;
}
export declare class Http {
    private crawler;
    private source;
    constructor(crawler: Crawler);
    /**
     * Send request
     * @param url
     * @param method
     * @param body
     * @param httpHeaders
     */
    request(url: string, method?: Method, body?: Body, httpHeaders?: HTTPHeaders): Promise<Response>;
    /**
     * Append download task to the pool
     * @param url
     * @param filepath
     * @param options
     */
    download(url: string, filepath: string, options?: download.DownloadOptions): void;
    /**
     * Download resource
     * @param url
     * @param filepath
     * @param options
     */
    downloadResource(url: string, filepath: string, options?: download.DownloadOptions): Promise<void>;
    /**
     * Cancel all request
     */
    cancel(): void;
    private createResponse;
}