Connect Frontend and Backend in same task description in ECS, AWS Fargate

Question

Issue:Access to XMLHttpRequest at 'http://localhost:3015/calculate' from origin 'http://xx.xx.xx.xxx:3000' has been blocked by CORS policy: The request client is not a secure context and the resource is in more-private address space `local`. directivity.js:10 POST http://localhost:3015/calculate net::ERR_FAILED

I saw a post recently in AWS where If your frontend and backend containers are hosted in the same ECS task, your frontend application can talk to your backend container through localhost.

My local host are specified in my environmental variables in the task definition for the frontend portion of the container.

i am quite stuck on this

Riku_Kobayashi · Answer

Hello.

The front-end code actually runs on the browser, so I think you need to specify the back-end's public IP address etc. to access the back-end from the front-end code.  
I think it depends on how the application is made, but I think you can access it by specifying the following in code such as front-end JavaScript.  
```
http://backend-public-ip
```

Connect Frontend and Backend in same task description in ECS, AWS Fargate

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