Custom HTTP Error Handling in Elixir Phoenix REST APIs

Nicholas Moen's article serves as a practical tutorial for Elixir developers using the Phoenix framework to create REST APIs. The post addresses a common requirement in web development: the ability to terminate a request early while returning a custom HTTP error response such as a 'HTTP 403 Forbidden' status with a personalized message. The tutorial demonstrates the creation of a custom exception module that can be raised anywhere within the request-response cycle, enabling developers to conditionally trigger specific HTTP error responses. The article also includes instructions for Phoenix versions before and after 1.7, ensuring compatibility across different versions of the framework. Additionally, the blog post redirects readers to a companion GitHub repository with example code for hands-on practice.