Downloading Http Debuger 11.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free Mac app was originally developed by Softlibs. The program lies within Developer Tools, more precisely Webmaster Tools.
From the developer:
Http Debuger is a simple HTTP testing tool. The application allows you to view all HTTP components easily, such as the status, the bytes, the time, the parameters, the request body, the response header, and the response body. The interface lets you see the HTTP elements conveniently displayed on separate panels.
You may want to check out more software for Mac, such as GSA HTTP Sniffer, Debug The Api or HTTP Client, which might be similar to Http Debuger.
Browser plugins
Debugging Tools