In this guide, we break down HTTP 400 and 500 error codes to help developers and site owners diagnose website issues effectively.

Website reliability and user experience are critical in the digital world. No one likes encountering error messages—whether you’re a visitor, site owner, or developer. Understanding HTTP error codes is essential for diagnosing and fixing website issues. In this post, we’re going to be talking about two very common error code groups—400 and 500. These errors can impact your website or application, causing performance issues and disruptions. We will have examples, some technical clarifications, and actions to take.