Easy request logging on OSX
Here's a great way to capture HTTP request/response traffic on OSX. I use this to help troubleshoot strange issues in Capybara/Selenium tests with Firefox
In your terminal where you are launching your tests from export these variables
export NSPR_LOG_MODULES=timestamp,nsHttp:3
export NSPR_LOG_FILE=~/Desktop/log.txt
Now when you run the tests your request and response traffic will be written to ~/Desktop/log.txt