Charles Proxy Settings

Charles Proxy for iOS development – simulating 3g

Charles Proxy is a great tool for web developers and it can help you in mobile apps too.

Here’s what you’d need to set it up:

  1. Run charles on your pc / mac, go to Proxy -> Proxy Settings and note the proxy port
  2. In your device network settings, enable http proxy and enter its ip and port (see below for ios)
  3.  Back to charles, click on Proxy -> Throttling Settings and enable throttling while choosing the 3G Throttle Preset. In the example below i’ve created another preset where i’ve lowered the in/out bandwidth even further

That’s it – now go use your app and watch in the charles screen the requests.

For extra credits, you can introduce packet loss/reordering by running

tc qdisc change dev eth0 root netem delay 10ms reorder 25% 50%

in your box – see netem for more