What is the url of my uploaded files? How can I check it?

Hello, Everyone. I am the new to IPFS, especially Helia.
The problem is that my code runs well but I can’t find the url of uploaded files.
My code is following.

app.js

import { unixfs as createUnixfs } from "@helia/unixfs";
import Path from "path";
import fs from "fs";
import { createHelia } from "helia";
import { exec } from "child_process";
import express from 'express';
import { raceSignal } from 'race-signal';

const router = express.Router();
const directory = "./DevFolio";
const helia = await createHelia();
const unixfs = createUnixfs(helia);
let files = 0;
let totalFileCount = 0;
const startTime = Date.now();

const addDir = async function (dir) {
    const dirents = await fs.promises.readdir(dir, { withFileTypes: true });
    let rootCid = await unixfs.addDirectory();

    await Promise.all(dirents.map(async dirent => {
        const path = Path.join(dir, dirent.name);
        console.log(path);
        const cid = dirent.isDirectory() ?
        await addDir(path) :
        await unixfs.addFile({ content: fs.createReadStream(path, { highWaterMark: 16 * 1024 }) });

        rootCid = await unixfs.cp(cid, rootCid, dirent.name);

        files++;
        console.log(files);
        console.log(rootCid);
        console.log(`${((Date.now() - startTime) / 1000).toFixed(1)}s: ${files} Files, ${(files * 100 / totalFileCount).toFixed(2)}%`);
    }));

    return rootCid;
};

router.post('/', async (req, res) => {
    try {
        totalFileCount = await new Promise(
            resolve => exec(`find ${directory} | wc -l`, (_, result) => resolve(+result))
        );
        console.log(totalFileCount)
        // const signal = raceSignal(100000); // create a signal with a 15 second timeout
        try {
            const rootCid = await addDir(directory); // pass the signal to the addDir function
            console.log(rootCid);
            res.status(200).json({ message: "success" });
        } catch (error) {
        // handle the AbortError if the operation is aborted
            if (error.name === 'AbortError') {
                console.log('The addDir operation was aborted');
            // you can return a default value, retry the operation, or do something else here
                res.status(500).json({ error: 'The operation was aborted' });
            } else {
                // handle other errors
                console.error(error);
                res.status(500).json({ error: error.message || "Internal Server Error" });
            }
        }

    } catch (error) {
        console.error(error);
        res.status(500).json({ error: error.message || "Internal Server Error" });
    }
});
export default router;'''

server.js

// require('dotenv').config();

import express from 'express';

import cors from 'cors';

import bodyParser from 'body-parser';

import cookieParser from 'cookie-parser';

import http from 'http';

import router from './app.js'

const app = express();

const httpServer = http.createServer(app);

// express init

app.use(bodyParser.urlencoded({ extended: false }));

app.use(bodyParser.json());

app.use(cors());

app.use(cookieParser())

// api routes

app.use('/', router);

const port = process.env.PORT || 5000;

httpServer.listen(port, () => {

console.log('listening on *:' + port);

});

The CID of the result is bafybeicvyjov6kq3ozzwnmdqkjopscwijrc3a43sgrxaz44irse77tscui .
So, I tried to connect to /ipfs/bafybeicvyjov6kq3ozzwnmdqkjopscwijrc3a43sgrxaz44irse77tscui/ but 504 gateway error occurs. How can I fix it?