👀 Views: 255 💬 Answers: 1 📅 Created: 2025-09-07

ruby rails cors api Ruby

Does anyone know how to I'm wondering if anyone has experience with I'm working on a project and hit a roadblock. Hey everyone, I'm running into an issue that's driving me crazy. Currently developing a Ruby on Rails application intended to serve as an API for a React frontend. In my staging environment, I've run into issues with CORS configuration that prevent my frontend from making successful requests to the API. I set up the `rack-cors` gem following the official documentation. Here's how my `config/application.rb` looks: ```ruby module YourApp class Application < Rails::Application config.middleware.insert_before 0, Rack::Cors do allow do origins '*' # For testing purposes resource '*', headers: :any, methods: [:get, :post, :put, :delete, :options, :head] end end end end ``` Despite this setup, the browser console throws a CORS error indicating that the `Access-Control-Allow-Origin` header is missing from the response. I’ve verified that the requests are indeed reaching my Rails server since I can see the logs capturing incoming requests. To troubleshoot, I tried the following approaches: 1. **Verifying Rack Middleware Load Order**: I checked the middleware stack using `rails middleware` command to ensure `Rack::Cors` is being loaded correctly. 2. **Environment-Specific Configuration**: I attempted to move the CORS configuration into a specific initializer file at `config/initializers/cors.rb` and explicitly set it there: ```ruby Rails.application.config.middleware.use Rack::Cors do allow do origins 'http://your-frontend-url.com' resource '*', headers: :any, methods: [:get, :post], expose: ['access-token', 'expiry', 'uid', 'client'] end end ``` 3. **Testing Different Origins**: Temporarily changed `origins '*'` to allow specific URLs, but this didn’t resolve the issue either. Also tried running the server with `rails s -b 0.0.0.0` to bind to all interfaces, in case it was a binding problem. I’m not sure if any additional headers are needed in my responses. I’ve included `rack-cors` in my Gemfile and ran `bundle install`, so it should be available. Could there be other factors at play here that I might be overlooking? Any pointers on what I should check next would be greatly appreciated! For context: I'm using Ruby on Windows. Any ideas what could be causing this? For context: I'm using Ruby on Ubuntu. I'm working on a application that needs to handle this. Could this be a known issue?