Headers Middleman is a free Chrome add-on developed by dingoeatingfuzz that allows users to easily modify HTTP headers for any request. With this tool, users can add, remove, or modify headers based on regular expressions, providing a quick and efficient way to customize headers for HTTP requests.

One of the key features of Headers Middleman is its regular expression based URL matching. This allows users to specify patterns for matching URLs, ensuring that the modifications are applied only to the desired requests. Whether it's modifying headers for a specific domain or a group of URLs, this feature provides flexibility and precision.

In addition to URL matching, Headers Middleman also enables users to add arbitrary headers to requests. This can be useful for various purposes, such as adding custom authentication tokens or modifying user-agent headers. Similarly, the tool allows users to remove arbitrary headers, ensuring that unwanted headers are not included in the requests.

One of the standout features of Headers Middleman is its immediate updating capability. Any changes made to the headers take effect immediately, allowing users to test and observe the modifications in real-time. This saves time and effort, as there is no need to reload the page or restart the browser.

Overall, Headers Middleman is a powerful and user-friendly Chrome add-on that simplifies the process of modifying HTTP headers. With its regular expression based URL matching, ability to add and remove arbitrary headers, and immediate updating feature, it provides a convenient way for users to customize headers for their HTTP requests.