import { NextFunction, Request, Response } from "express";
export declare class Passthrough {
    private errorReporter;
    getHandler(): (req: Request, res: Response, next: NextFunction) => Promise<void>;
    isPassthroughRequest(req: Request): boolean;
    isAcceptingHtml(req: Request): boolean;
    getForwardUrl(req: Request): string;
    getRequestConfig(forwardUrl: string): any;
}