Resolving the Phoenix.Socket Check_origin Error

The article addresses the Phoenix.Socket check_origin error that developers often encounter when deploying applications. It explains that this error arises due to a mismatch between the expected origin and the actual origin of WebSocket connections, specifically when users access the application via an outdated or incorrect domain. The author explains that the error can be triggered when users visit a temporary domain that was used before the official launch, leading to broken LiveViews or socket connections. To fix this, the author suggests implementing a redirect plug in the browser pipeline that automatically redirects users from the incorrect domain to the correct one, ensuring that all WebSocket connections adhere to the expected configurations. Additional considerations are mentioned for scenarios involving multi-tenancy or different client-side applications.