I don't understand javascript

or private networking

I have another service that should hit the api on startup, then close gracefully. It crashes

fancy meeting you here

what kind of react app?

uhh

website?

I started with your template

Okay, realizing I may be stupid and private networking won't work because it's a frontend

But that doesn't explain why the environment variable isn't working

Or why my other service can't hit the api

depends, if it's vite, then the variable needs to be prefixed with VITE_ if it's create-react-app then the variable needs to be prefixed with REACT_APP_

you might not be listening on IPv6? or you aren't specifying the port in the url, or both?

Should be listening on IPv6?

Damn. I thought that was a weird convention, will put it back

yep that should do it, what is the full url you are trying to call?

that's fair tbh, it's tripped me up too

http://habitica_tools.railway.internal:5000/setupCron

do you have a PORT variable set to 5000?

Yep

okay, and is this gunicorn app in the same railway project?

Oui

okay, what exactly is trying to make the request? the fetch API from nodejs? fetch in a web browser?

I'm not too familiar with js so don't know the specifics, but here's a code snippet

Just updated the var name

Getting somewhere!

If I have to use the public URL because of my implementation that's fine. It's not sending a ton of data

oh so this is a request from the web browser?

Yeah

There's also a request from another python service that's not working

From the screenshot up here

if this is a browser trying to make the request, you need to use the public url

Super simple code + some stackoverflow stuff that should force ipv6

just do BACKEND_URL + "/setupCron"

and set the backend url to include the http:// and port part

Testing that now

and that url leads to the app shown here?

Yes

and that app that is calling it, is in the same project right?

Yep

wait… what

Why does it print the full url earlier but not here

there's no syntax difference between the two f strings

lol python is fun

What the hell

remove that family stuff

Just did, didn't work

Gonna be honest here, I've literally never gotten the private network to work

Now, a couple times was because I didn't know you couldn't call it from a react service, which makes total sense now that I think about it

But it's just funky

IPv6 can be tricky

It should be ipv6 with the family stuff enabled, HAS_IPV6 is true

Will keep looking into it

I'll give your project a look over when I'm back at the laptop

project id please

b3614c25-edc6-4752-b27d-9abc10f5adcf

i lied

you forgot --bind

ah shit

my bad

You're good I'm the one who forgor

this is returned in an api call the dashboard makes, wish it was made visible in the product for the user to see somehow

It worked! Thanks for helping fix such a stupid mistake lol

I have a ticket to track how many times I have to look at sockets.ipv6 lol

hopefully if it gets enough traction the information can be exposed to the end user

Yeah that'd be very nice. At least as a warning near the private url

it gets a little tricky since a service can listen on multiple ports

I thought that the proxy sends all requests to one port?

yeah the public proxy, but we are talking about the private network

Ah I figured that it worked much the same

nope, no proxy internally

There are decent docs on how to use it, but no specifics about how it actually works in comparison to the public network

just works like a local area network, with a nice domain and IPv6 only

So all services effectively just take different ports within the .railway.internal host? I'm assuming that two services can't have the same port then

Not sure if that's documented

two services can have the same port, services listen on whatever port they listen on and are accessible on whatever port they do listen on

literally think of it as a LAN network

So if two services have the same port, they'll both recieve requests meant for the other?

I'm not sure what the LAN behaviour for that is lol

no, they will receive the traffic that is destined to them

internally your app does a DNS lookup, gets the IP and then sends the traffic to that IP and port

Will they not both be assigned HOSTNAME:5000 (for example) if they both have the same port?

they are separate services though

How does the origin know which service to send to?

Right, but they share a port

so? they have different IPs

If the only point of reference is the port number, I don't see how the IP comes into play

are we talking about traffic coming in publicly or privately?

privately

If service A wants to send to service B, but service B shares a port with service C. Service A sends a request to HOSTNAME:PORT

then it does a DNS lookup for the host, gets its IP, and then sends the data to that IP + port, each service has its own IP

But how would it know which service to send to, there's no identifier that would tell one from the other

the IP is the identifier

I get that each service has its own IP, but if both are listening on HOSTNAME:PORT how does the origin's code know which IP to send to

whatever IP was returned from the DNS lookup

That's not answering my question

Let's say we have 3 services. Two are listening on project.railway.internal:5000. The third sends a request to project.railway.internal:5000

Which service does the third send the request to

I'm not understanding how the issue of two services sharing a port is resolved

you just gave me the same 3 domains?

I did, two are listening on the same port on the private network

you can't have the same domains

domains need to be unique per environment

So two services on the private network cannot listen on the same port?

they can listen on the same ports, they just can't have the same domain

But will their hostname not be the same? I thought that was unique per project

Assuming two services in the same project

no, every service in an environment will have a unique domain

Ah there we go that's what I was missing

I mean it's the same for the public network

I made an assumption based on the private network hostname for the backend api we worked out last night

my bad

two people can't own google.ca at the same time, legal reasons aside

lol right

looks like you changed the service name and left the private domain as it was originally

you would not be able to make another service with the same private domain, it would get a different domain

Makes sense

feel free to mark as solved if you dont have anymore questions 🙂

!s