Railway•2y ago

How to use a reverse proxy with railway

Note: Yes I know railway offers it's own reverse proxy and load balancing. I'm trying to set up a reverse proxy to front my services so that they can all "use" the same custom domain. I've got HAProxy set up, however when I try using it I actually end up hitting the railway backboard. Does anyone know how to get by this?

69 Replies

Percy•2y ago

Project ID: d7c966b3-07dd-4a31-9cb9-82de5002e54f

ShahOP•2y ago

d7c966b3-07dd-4a31-9cb9-82de5002e54f It seems that the proxy is resolving the internal IP of my service and attempting to connect to that Edit: nope nvm I was logging the wrong thing, the ip address is resolved correctly but I'm still hitting railway's backboard

Brody•2y ago

might not be a very useful suggestion, but you could try caddy instead? https://caddyserver.com/docs/caddyfile/directives/reverse_proxy#examples https://github.com/alphasecio/caddy-on-railway

ShahOP•2y ago

Yeah I'll give it a shot Still the same issue

Brody•2y ago

can i see your caddyfile?

ShahOP•2y ago

caddyfile

Brody•2y ago

https://testing-service.up.railway.app/

{
    auto_https off
}

:{$PORT}

reverse_proxy https://frontend-dev-9cb6.up.railway.app {
  header_up Host {upstream_hostport}
}

{
    auto_https off
}

:{$PORT}

reverse_proxy https://frontend-dev-9cb6.up.railway.app {
  header_up Host {upstream_hostport}
}

ShahOP•2y ago

I'll try that

Brody•2y ago

works for me 🤷‍♂️

ShahOP•2y ago

Strange it's still not working for me

Brody•2y ago

skill issue whats the service url of this proxy you are setting up

ShahOP•2y ago

There isn't one right now, I'm trying to get it working locally first

Brody•2y ago

ShahOP•2y ago

Bruh How

Brody•2y ago

used that exact same caddyfile i provided

ShahOP•2y ago

I am using that exact file and all I get is 404s

Brody•2y ago

whats your start command

ShahOP•2y ago

PORT=8080 caddy run Though it doesn't seem to be picking up the port

Brody•2y ago

windows?

ShahOP•2y ago

ubuntu

Brody•2y ago

well if it works on windows, nows a good time to switch kidding but yeah i dont know, on windows i ran "set PORT=3000" then ran "caddy.exe run" and it just worked

ShahOP•2y ago

I wonder if something is using my 8080 Nope setting other values doesn't do anything And the reverse proxy still gives 404s on the port caddy auto grabs

Brody•2y ago

i dont think i can help much anymore, i dont have any linux machines to do further testing

ShahOP•2y ago

No worries, thank you peepoLove2

I got it working I had the caddyfile written as "caddyfile" and not dead

Brody•2y ago

omg i thought you just didnt care enough to capitalize that word when messaging like i didnt

ShahOP•2y ago

LMAO Sorry about that

Brody•2y ago

so i was right tho, skill issue but glad you got it

ShahOP•2y ago

Thanks!

Brody•2y ago

no problem!

ShahOP•2y ago

It looks like caddy is resolving the internal network address when deployed Causing 502s

Brody•2y ago

I'm sorry I don't know what to tell you, that caddyfile worked for me to proxy to your apps domain

ShahOP•2y ago

Did it work on railway too?

Brody•2y ago

Yes

ShahOP•2y ago

I must be missing something

Brody•2y ago

I sent you that testing domain, that was me deploying caddy with that caddyfile to a testing service I have for these types of help requests I have since removed the deployment tho

ShahOP•2y ago

No worries, there must be something else The proxy works running locally It's just in railway it's resolving the internal IPs for my other services Is there something in here that sticks out to you?

ShahOP•2y ago

Caddyfile

Brody•2y ago

And that all works locally?

ShahOP•2y ago

Yeah Though, one thing that might be the issue BACKEND_URL and FRONTEND_URL are shared variables from other services Defined as such

ShahOP•2y ago

ShahOP•2y ago

The idea is the services both make a var with the RAILWAY_STATIC_URL value

Brody•2y ago

Use the actual URLs in the caddyfile and see if that works Your apps are setting environment variables in code?

ShahOP•2y ago

No, these are set purely from the UI Each service has a RAILWAY_STATIC_URL variable which I am saving into BACKEND_URL for example, and then sharing that

Brody•2y ago

yeah those variables aren't exported

ShahOP•2y ago

How can I get them exported?

Brody•2y ago

cant as far as i know

ShahOP•2y ago

Oh rip

Brody•2y ago

just put the urls in the caddyfile

ShahOP•2y ago

They won't work for PR environments 😦

Brody•2y ago

pr?

ShahOP•2y ago

Yeah I have PR environments enabled

Brody•2y ago

i dont do github, i dont know what that is

ShahOP•2y ago

Ahh okay It's basically a new environment that gets spun up when I open a pull request

Brody•2y ago

im gonna be honest with you, i think you're overly complicating this

ShahOP•2y ago

How so?

Brody•2y ago

why must your frontend use one domain?

ShahOP•2y ago

It makes cors handling and load balancing easier

Brody•2y ago

i dont think i would call this thread easy

ShahOP•2y ago

Yeah it's not easy, but our current solution is getting dumb lol We have middleware in each service that uses regex patterns to validate hosts

Brody•2y ago

isnt the browser supposed to validate cors and host stuff?

ShahOP•2y ago

It also makes it harder to send analytics data since it gets blocked by firewall etc Yes but it uses preflight requests for that Those requests have to be handled by the backend That's where the middleware runs

Brody•2y ago

sounds like youve engineered yourself into a corner

ShahOP•2y ago

In a way yes

Brody•2y ago

take a step back and reevaluate this all?

ShahOP•2y ago

Yeah this is starting to become more trouble than we thought it'd be

Brody•2y ago

i wish you good luck

ShahOP•2y ago

Thanks!

Amrit•2y ago

Just came to say I was trying to use nginx for a reverse proxy as well for a similar use case. Ended up trying out caddy and it worked on the first try. Many thanks!

Brody•2y ago

glad my old help is still usefull 🙂

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How to use a reverse proxy with railway