Application failed to respond

Hey there! We've found the following might help you get unblocked faster:

• 📚 Application Failed to Respond

• 🧵 Application Failed to Respond

• 🧵 Application failed to respond

• 🧵 Application failed to respond

If you find the answer from one of these, please let us know by solving the thread!

How to make it work properly？？？

Heyyy!!

A 502 error usually means the app isn't starting up properly. I’d recommend checking your deploy logs first there’s often a clear error there that can point you in the right direction (like a crash, missing env variable, or wrong port). If you’ve already tried a few things, maybe try redeploying or rolling back to a working version. Happy to look at logs with you if you want to share more!

Can I get a bit more info about your project? What language/stack is it? Is it a backend api or a website? What frameworks? Are you using a custom domain?
Any info is helpful

nextjs is used, API and web, custom domain, 8080 port

https://station.railway.com/questions/bad-request-error-502-0cc25a69

I helped someone recover from the 502 error for the next.js application. You can have a look at that thread, and see if something helps your out. Before that, I receommend you check thta port defined in your server file, & under the Public Networking settings of the app deployed on Railway matches or not!

Public Networking port:8080, Variables port: 8080, next.config.js :

  "scripts": {
    "dev": "next dev",
    "build": "next build",
    "start": "next start -H 0.0.0.0 -p $PORT", 
    "lint": "next lint"
  },
Now it is like this, but it does not work. It was changed to 3000, but it did not work.

The project includes a Dockerfile. Does it have anything to do with it?

Yes, can you provide the Dockerfile here!

Also a snippet of your Public Networking settings of your Railway service would be great

Public Networking

Have you checked the deploy logs? What is the error that is showing up there! And also, please provide the custom domain link to access your application

Build Logs

Deploy Logs

No errors reported

custom domian: https://open.story321.com/

Can you make sure that no other service in your Railway environment is using port 8080? Because that way, the port required by your next.js app would never be free to access.

Also, can you please provide a screenshot of what is in the dropdown of the port number shown under the custom domain of networking settings!

no other, only this one project.

only 8080 port

As a last resort, can you please provide the configuration lines for your server js file, which can help us to see a potential reason for error!

my nextjs project dose not have server.js file

Can we have the github repo, if possible?

can you try updating your start script to be:

"start": "node .next/standalone/server.js"

I tried this, but it doesn't work.

This project was previously deployed on Google Cloud Run. Now I'm deploying it on Railway. Are there any special settings required?

no, I'm running nextjs without any issue with a very basic dockerfile and without touching any hostname/port, can you share logs?

are you doing ssr request to other services? are the other services up and running?

also can you try removing:

# Optional but recommended: init + fonts for better PDF rendering RUN apt-get update \ && apt-get install -y --no-install-recommends \ dumb-init \ ca-certificates \ ffmpeg \ fonts-noto-cjk \ chromium \ libasound2 \ libatk1.0-0 \ libatk-bridge2.0-0 \ libc6 \ libcairo2 \ libcups2 \ libdbus-1-3 \ libexpat1 \ libfontconfig1 \ libgcc1 \ libglib2.0-0 \ libgtk-3-0 \ libnspr4 \ libnss3 \ libpango-1.0-0 \ libpangocairo-1.0-0 \ libstdc++6 \ libx11-6 \ libx11-xcb1 \ libxcb1 \ libxcomposite1 \ libxcursor1 \ libxdamage1 \ libxext6 \ libxfixes3 \ libxi6 \ libxrandr2 \ libxrender1 \ libxss1 \ libxtst6 \ libxshmfence1 \ libxkbcommon0 \ libdrm2 \ libgbm1 \ libwayland-client0 \ && rm -rf /var/lib/apt/lists/* RUN if [ ! -x /usr/bin/chromium ] && [ -x /usr/bin/chromium-browser ]; then ln -sf /usr/bin/chromium-browser /usr/bin/chromium; fi

it worked. i use default config, and the basic dockerfile.

and then i added the configuration i needed to the dockerfile, and it still worked.

but, there is another problem, the parameters in Variables are not read

for example, i config JWT_SECRET in the Variables, but the Deploy Logs have this error: Error JWT_SECRET environment variable is not set

did you redeploy after setting the variable?

yes, after setting the variable, i redeploy multiple times, but the same error:Error JWT_SECRET environment variable is not set

can you try logging prcess.env.JWT_SECRET in a server side page or api? don't share it but just check if you see something, are you using library like envalid?