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404 Not Found Next.js error on React-Query fetch

Asked By: Anonymous

Here is my situation. I am trying to set up a Next.js project with an Express.js back-end. I did set up the back-end as a regular one not as a custom server according to Next.js documentation. So I am not sure if I am already making a mistake by setting up the back-end as a regular one. I am trying to fetch data from a back-end endpoint http://localhost:3500/api/v1/list using axios and it works well. But when I am trying to implement React-Query on the first load I am getting the right data from the back-end but when it is trying to re-fetch for some reason it is hitting the wrong end-point http://localhost:3600/api/v1/list and getting the 404 Not Found error. It looks like it is switching the port from 3500 to 3600 which is a front-end port. Here you will find the link to the repository and here is the code. Let me know if I am doing something wrong,


import axios from 'axios';
import { useQuery } from 'react-query';

export default function SellPage({ response }) {
  const { data, isLoading, error } = useQuery('sells', getPosts, {
    initialData: response,

  console.log('data useQuery: ', data);

  if (isLoading) return 'Loading...';
  if (error) return error.message;
  return (
      <p>Hello SellPage!!{data.message}</p>

export async function getServerSideProps(context) {
  const response = await getPosts();
  console.log('response', response);
  if (!response) {
    return {
      notFound: true,

  return {
    props: { response }, // will be passed to the page component as props

async function getPosts() {
  console.log('HOST: ', process.env.HOST);
  const { data } = await axios.request({
    baseURL: process.env.HOST,
    url: '/api/v1/list',
    method: 'get',
  return data;


import React from 'react';
import { QueryClient, QueryClientProvider } from 'react-query';
import { ReactQueryDevtools } from 'react-query/devtools';

const queryClient = new QueryClient();

function MyApp({ Component, pageProps }) {
  const queryClientRef = React.useRef();
  if (!queryClientRef.current) {
    queryClientRef.current = new QueryClient();
  return (
      <QueryClientProvider client={queryClientRef.current}>
        <Component {...pageProps} />
        <ReactQueryDevtools initialIsOpen={false} />

export default MyApp;


Answered By: Anonymous

I don’t see a next.config.js in your repo, so I guess the env variables are not bundled in the js and in the end you url looks like localhost: or localhost:undefined which the browser default to the port your client is served.

Try add next.config.js

module.exports = {
  env: {
    HOST: process.env.HOST,


Another way is to use public runtime variables

module.exports = {
  publicRuntimeConfig: {
    // Will be available on both server and client
    port: 3500,

// Then
import getConfig from 'next/config';

// Only holds serverRuntimeConfig and publicRuntimeConfig
const { publicRuntimeConfig } = getConfig();


But note that runtime config would impact optimization and you might get larger bundle in the end so you might want to try build time variables first.

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