I do web development on Windows for my day job, and I rely a lot on Fiddler, which is web debugging proxy. What is an equivalent tool for OS X?
I use CharlesProxy, and while it isn't as scriptable as Fiddler, it does the job. And with single license key, you can run it on all OSes (it's written in Java).
My needs were little different when I needed it ... I used it to debug webdav connections or to debug http communication between servers.
http://mitmproxy.org/ is text-based tool, but does a great job. For any http-speaking app you want to analyse, and even modify and replay requests.
Fiddler now has an Alpha build based on Mono.
If you just want to see HTTP traffic, try Cellist.
It's a Chrome extension that lets you view and modify HTTP requests in the current tab's scope
Captor, available on mac app store
It's a native app , can capture HTTP/HTTPS just like CharlesProxy.
There's a mac version now via mono. Install Fiddler on Mac OSX About the App
App name: Fiddler App description: fiddler (App: Fiddler.app) App website: http://www.telerik.com/fiddler Install the App
Press Command+Space and type Terminal and press enter/return key. Run in Terminal app: ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null ; brew install caskroom/cask/brew-cask 2> /dev/null and press enter/return key. Wait for the command to finish. Run: brew cask install fiddler Done! You can now use Fiddler.