CORS Issue on Express / Changes do not take effect.

[zz0905k]

First, my english is not good so if you have content that is not well understood, comment and requestion to me. thanks

Yesterday, my project on front-end have a cors error like this.

My source code only allow localhost about cors. So i change source code like this.(also success to deploy)(I use cors libary to solving cors problem)

And retry… but nothing change. And i found wierd point.
access-control-allow-origin on http server response does not change.

Please give me some advice. If there’s any information that I couldn’t provide, please leave a comment. thank all .

[jphenow]

Hey!

What does it look like if you run the app locally?

Do you have that set differently in the app elsewhere?

[zz0905k]

There was no problem when running in a local environment. (CORS issue not present)

Luckily, my team found possible error in fly.io, and fix Like this. successful. Now it’s work!

const frontUrl = process.env.FRONT_URL || "https://SOMTHING.netlify.app";

apiRouter.use("/", cors({ origin: frontUrl }));

I’m so grateful that you even replied. Thank you very much for your interest in my problem.

Have a good day. jphenow !!

[jphenow]

Glad you were able to figure out your issue!