Firestore and Firebase Cloud Functions - firebase

Question

I have a simple https firebase cloud function which get all user doc from firestore but it actually give me error of
Received RST_STREAM with code 2 triggered by internal client error: Protocol error
This is my index file is
I have initailized the app
import * as functions from "firebase-functions";
import * as admin from "firebase-admin";
import {helloWorld} from "./apis/recJobs";
// eslint-disable-next-line #typescript-eslint/no-var-requires
const serviceAccount = require("../serviceAccount.json");
admin.initializeApp({
credential: admin.credential.cert(serviceAccount),
databaseURL: "*************",
});
// APIs
export const hello = functions.region(
"asia-south1"
).https.onRequest(helloWorld);
This is my HelloWorld Function which is straight forward to get all docs from firestore
import * as admin from "firebase-admin";
export const helloWorld = (req :any, res:any) => {
try {
// get all users doc
const db = admin.firestore();
// get all docs from user
const snapshot = db.collection("user").get();
snapshot.then((data) => {
console.log("data is :", data);
res.status(200).send({
ok: "Success",
});
}
).catch((error) => {
console.log("error is :", error);
res.status(400).send({
ok: error,
});
}
);
} catch (error) {
console.log("error is :", error);
res.status(400).send({
ok: "Final error",
});
}
};
It should return all the user docs