Working with Faraday or some other Ruby thing and want to use the Charles Web Debugging Proxy with SSL Proxy mode turned on so that you can listen to SSL request/responses? You want something like this.

gistfile1.rb

client = OAuth2::Client.new(API_CLIENT, API_SECRET, {
  :authorize_url => 'https://accounts.google.com/o/oauth2/auth',
  :token_url => 'https://accounts.google.com/o/oauth2/token',
  
  # Set options that get passed on to Faraday
  :connection_opts => {:proxy => { :uri => 'http://127.0.0.1:8888'} },
  :ssl => {:verify => false}
})

Derp. Forgot to sign in before I made this.