Service Returns Sporadic 503s, due to DDOS protection?

const honoUrl = "https://hono-test.up.railway.app/";

// ~200 reqs per second.
const concurrency = 100;
const delayMs = 500;

let errors = 0;
let numReqs = 0;

const delay = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
const makeTestRequests = async () => {
    try {
        const response = await fetch(honoUrl);
        const data = await response.json();
    } catch {
        errors++;
    }
    numReqs++;
};

while (true) {
    const start = Date.now();
    // Make a bunch of requests concurrently.
    await Promise.all(
        Array.from({ length: concurrency }, () => makeTestRequests()),
    );
    const now = Date.now();
    const elapsed = now - start;
    console.table({ errors, numReqs, elapsed, now });
    // Wait before going again.
    await delay(delayMs);
}

export type {};

const honoUrl = "https://hono-test.up.railway.app/";

// ~200 reqs per second.
const concurrency = 100;
const delayMs = 500;

let errors = 0;
let numReqs = 0;

const delay = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
const makeTestRequests = async () => {
    try {
        const response = await fetch(honoUrl);
        const data = await response.json();
    } catch {
        errors++;
    }
    numReqs++;
};

while (true) {
    const start = Date.now();
    // Make a bunch of requests concurrently.
    await Promise.all(
        Array.from({ length: concurrency }, () => makeTestRequests()),
    );
    const now = Date.now();
    const elapsed = now - start;
    console.table({ errors, numReqs, elapsed, now });
    // Wait before going again.
    await delay(delayMs);
}

export type {};

import { Hono } from "hono";

const app = new Hono();

app.get("/", (c) => {
    return c.json({ now: Date.now() });
});

export default {
    fetch: app.fetch,
    port: process.env.PORT || 3000,
};

import { Hono } from "hono";

const app = new Hono();

app.get("/", (c) => {
    return c.json({ now: Date.now() });
});

export default {
    fetch: app.fetch,
    port: process.env.PORT || 3000,
};