/**
 * Performs get request to url with headers.
 * @param  {String}    url
 * @param  {Function}  callback    function(error, response, body) {}
 * @param  {Object}    headers     Hash with headers, e.g. {'Referer': 'http://google.com', 'User-Agent': '...'}
 */
export declare function get(url: any, callback: any, headers: any): any;
/**
 * Performs post request to url with headers.
 * @param  {String}        url
 * @param  {String|Object} body        Will be passed as form data
 * @param  {Function}      callback    function(error, response, body) {}
 * @param  {Object}        headers     Hash with headers, e.g. {'Referer': 'http://google.com', 'User-Agent': '...'}
 */
export declare function post(url: any, body: any, callback: any, headers: any): any;
/**
 * Performs get or post request with generic request options
 * @param {Object}   options   Object to be passed to request's options argument
 * @param {Function} callback  function(error, response, body) {}
 */
export declare function request(options: any, callback: any): any;