ugly ftp2http server

Server.java

package com.goswiftly.http2ftp;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.URL;
import java.util.Base64;

import static spark.Spark.*;

public class Server {

    private static final Logger logger = LoggerFactory.getLogger(Server.class);

    public static void main(String[] args) {

        get("/*", (req, res) ->
                {
                    res.header("Content-Type", "application/zip");
                    String url = "ftp:/" + getAuthString(req.headers("Authentication")) + req.pathInfo();
                    logger.info("Fetching {}", url);
                    return new URL(url).openStream().readAllBytes();
                }
        );
    }

    static String getAuthString(String authHeader) {
        if (authHeader == null) return "";
        else return new String(Base64.getDecoder().decode(authHeader)) + "@";
    }
}