96da8bcc-24d9-4d45-882e-cb719989ea8d

It will help if your app bundles and servers the build files. However, I am not sure that it is your actual issue.
For an example on how to use Vite https://github.com/brody192/vite-react-template. This is Vite + react. But you can extract the Vite stuff for your use.
The important things, are that you are building the files (they end up in dist) and then you serve them using Caddy as a file server. You can even stack Caddy's btw
So, you should do the above. But regardless of that, I am not sure if it will actually fix your issue.

I would also make sure that all of your services are in the same region. If serving the dist files doesn't help; someone else can help you debug further

let me try this option first , i am thinking it might fix my issue

can you guide me how can i do this steps this is what i am thinking , run :1- npm run build , done , is that the only step i need to serve my files

So running build for vite, will crate a directory called dist. These are all static files but you need a way to serve said files to the user / client. To do that, you use Caddy, as seen in the example I sent. You will just need to add a PORT variable in railway. You can set it PORT=3000. I don't know what your build looks like. If you are letting railway handle it for you (not using docker or anything), you can just copy the nixpacks.toml. If you are using something like docker for your build; here is what I did

# official Bun image
# see all versions at https://hub.docker.com/r/oven/bun/tags
FROM oven/bun:latest as build
WORKDIR /app

COPY package.json bun.lockb .
RUN bun install --frozen-lockfile
COPY . .

RUN bun run build

FROM caddy:latest

copy --from=build /app/dist /dist/

COPY Caddyfile /etc/caddy/Caddyfile

RUN caddy fmt --overwrite /etc/caddy/Caddyfile

CMD exec caddy run --config /etc/caddy/Caddyfile --adapter caddyfile 2>&1

Actually, if you do it the way I show, you will also have to make 1 additional change.

- root * dist
---------
+ root * /dist

i am using nixpack so it seems the only step i need to do is run npm run build right ?

also i am getting error now from my backend 502 bad gateway

Can you show me your build logs? The top mainly. So we can see what it was already doing

nixpack toml file txt : # https://nixpacks.com/docs/configuration/file

set up some variables to minimize annoyance

[variables]
NPMCONFIGUPDATENOTIFIER = 'false' # the update notification is relatively useless in a production environment NPMCONFIGFUND = 'false' # the fund notification is also pretty useless in a production environment CADDYVERSION = '2.7.4' # specify the caddy version to use here, without a 'v' prefix. https://github.com/caddyserver/caddy/releases

download and untar caddy

[phases.caddy]
dependsOn = ['setup'] # make sure this phase runs after the default 'setup' phase
cmds = [
'curl -fsSLo caddy.tar.gz "https://github.com/caddyserver/caddy/releases/download/v${CADDYVERSION}/caddy${CADDYVERSION}linuxamd64.tar.gz"', # download the caddy release specified by 'CADDYVERSION' from GitHub
'tar -zxvf caddy.tar.gz caddy', # only extract 'caddy' from the tarball
'chmod +x caddy' # enable file execution for caddy, needed to execute downloaded files
]

format the Caddyfile with fmt

[phases.fmt]
dependsOn = ['caddy'] # make sure this phase runs after the 'caddy' phase so that we know we have caddy downloaded
cmds = ['caddy fmt --overwrite Caddyfile'] # format the Caddyfile to fix any formatting inconsistencies

copy caddy and build artifacts to a new image and start the caddy web server

[start]
runImage = 'ubuntu:20.04' # use a new ubuntu image to run the caddy server in
onlyIncludeFiles = ['caddy', 'Caddyfile', 'dist'] # copy only the needed files and folders into the new image (Vite builds to a 'dist' folder)
cmd = './caddy run --config Caddyfile --adapter caddyfile 2>&1' # start caddy using the Caddyfile config and caddyfile adapter

sorry for being late

And the result?

this works for me but i have not build still i am waiting your guide of the steps pleae