Mac users interested in Web server log analyser generally download:
HTTP Scoop passively listens for HTTP requests from any browser (or other application for that matter) running on your Mac.
If you're running a web server or an application server on your machine then you will see requests going to that too.
You can view request or response data as text or in a hex dump, view images from within the app and save responses to disk.
Additional suggestions for Web server log analyser by our robot: