HTTP headers are part of a website response that are normally hidden and can only be seen by a browser. They are a bit of code that informs the browser what it should do when opening the website. Essentially, they transfer data from a browser to the server and vice versa. These headers carry important information about the browser, the webpage, and the server itself. While HTTP headers can help you see important information like software versions, content types, and cookie strings, the status codes are arguably the most important. An HTTP status code will quickly and easily tell you the status of a given website. A good and functional URL should always return with a response of 200 to show a successful request has been made. In addition to 200, a few other common status codes include: 301 – Moved Permanently, 401 – Unauthorized, 404 – Not Found, 500 – Internal Server Error. This tools allow you to get the response status that the web server returns when requesting a URL.