How to Capture and Inspect iOS Traffic

You can use Fiddler Everywhere to capture and inspect traffic that comes from iOS devices and simulators. This article describes the required steps.


Fiddler Everywhere 1.0.0 and above
iOS All versions

Configure Fiddler Everywhere

  1. Enable the remote connections in Fiddler Everywhere client through Settings_ > Connections > _Allow remote computers to connect
  2. Remember the IP address of the machine on which Fiddler Everywhere is running. You can use built-in OS tools to obtain the IP address (like ipconfig on Windows or ifconfig on Linux) or the Fiddler Everywhere popup status on the bottom right part of the client. For demonstration purposes, let's assume that the local IP used by the machine (which runs Fiddler Everywhere) is

Configure iOS Device

  1. Go to Settings > WiFi on your iOS device.
  2. Find your current network and click the i icon.
  3. Scroll to the bottom and choose Manual in the Configure Proxy option.
  4. Type your IP address (for example, in the Server field.
  5. Type the Fiddler Everywhere listening port (8866 by default) in the Port field and finally tap on Save.

    With the current setup, you will be able to capture non-secure HTTP traffic. However, if you try to open any HTTPS website, you'll get the This site's security certificate is not trusted! error. To fix this, you will have to trust the Fiddler root certificate.

  6. Open a browser on the iOS device and type the Fiddler echo service address: http://ipv4.fiddler:8866
  7. Click the Fiddler root certificate link to download it.
  8. On your iOS device, open General and install the certificate through the Profile Downloaded. Note that this option will appear only after the certificate is downloaded.
  9. (iOS 10.3+) Go to General > About > Certificate Trust Settings and enable full trust for the DO_NOT_TRUST_FiddlerRoot certificate. Note that you will see the DO_NOT_TRUST_FiddlerRoot certificate only after completing the previous step.

Inspect Traffic

With all of the above done, you can immediately monitor HTTP/HTTPS traffic from your iOS device. For example, open a Safari browser on your iOS device, type an address of your choice, and observe the traffic being captured in the Live Traffic section of Fiddler Everywhere.

Once you're done debugging, don't forget to remove the WiFi proxy from your iOS device.

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