POST method is not working in fetch inside Queue Handler

import { Hono, Env } from 'hono'
import { env } from "hono/adapter";
import { send_to_queue } from '../utils/send-to-queue';

type Bindings = {
  REFERRAL_ENGINE_URL: string;
  DB_QUEUE: Queue;
}

interface QueueDataType {
  data: any;
  ref_url: string;
}

const app = new Hono<{ Bindings: Bindings }>()

app.get('/', (c) => {
  return c.json({ message: "Go Away" }, 200);
})

app.post('/', async (c) => {
  const data = await c.req.json()
  const EP_URL = env(c).EP_URL;
  console.log("Data Received")

  const Q_DATA : QueueDataType = {
    data: data,
    ref_url: EP_URL
  }

  await send_to_queue(Q_DATA, c)

  return c.json({ message: 'Request Received!' })
})

async function queueHandler(batch: MessageBatch<QueueDataType>, c: Context) {
  for (let message of batch.messages) {
    console.log("Data Received from Queue");
    try {
      console.log("Sending data to referral engine");
      console.log(message.body.data);
      console.log(typeof(message.body.data));
      const response = await fetch(`${message.body.ref_url}/api/v1/referral`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': 'Bearer 9e985a31cd0581672bf8454123662de7'
        },
        body: JSON.stringify(message.body.data),
      });

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
      }
      // await send_to_ref(message.body.data, message.body.ref_url);
      message.ack();
    } catch (error) {
      console.error("Error forwarding data from queue:", error);
      console.log("Retrying after 100 seconds");
      message.retry({ delaySeconds: 100 });
    }
  }
}

export default {
  fetch: app.fetch,
  async queue(batch: MessageBatch<QueueDataType>, c: Env){
    queueHandler(batch, c)
  },
};