🤔 Why Are Network Logs a Game-Changer for Mobile Test Automation?
Ever been in this situation?
✅ Your automated mobile tests run fine locally.
✅ They pass on your machine.
✅ But once they run on CI/CD, they mysteriously fail. 😱
Now you’re left scratching your head wondering:
Let’s face it—debugging test failures without proper network logs is like finding a needle in a haystack.
But what if you could see every request and response your app sends and receives in real time? 🎯
Welcome to MITM Proxy—the ultimate debugging tool that lets you capture and analyze your app’s network traffic like a pro! 🚀
This guide will help automation engineers, testers, and even curious college students set up MITM Proxy to monitor, capture, and debug mobile network traffic while running automation tests.
So, grab your coffee ☕, because we’re about to make debugging 100x easier!
🎯 What Will We Cover?
This is a 3-part series to help you integrate MITM Proxy into your mobile automation framework:
✅ Part 1 (This Article) – Set up MITM Proxy with an Android/iOS device.
✅ Part 2 – Capture and save real-time network logs for deeper analysis.
✅ Part 3 – Add automation-specific network logs to your HTML test reports.
By the end of this series, you’ll be a debugging ninja. 🥷🔥
🔍 What is MITM Proxy? And Why Should You Care?
💡 MITM Proxy stands for Man-in-the-Middle Proxy, a powerful tool that allows you to:
✅ Intercept all network traffic from your mobile app.
✅ Inspect HTTP & HTTPS requests in real time.
✅ Modify API responses for testing different scenarios.
✅ Replay previous API calls without re-running the entire test.
| Feature | MITM Proxy | Charles Proxy | Fiddler | Wireshark |
| Intercepts Requests in Real-Time | ✅ | ✅ | ✅ | ❌ |
| Works for Mobile Apps (Android/iOS) | ✅ | ✅ | ✅ | ❌ |
| Modify API Responses Dynamically | ✅ | ❌ | ❌ | ❌ |
| Command-Line Friendly (Great for CI/CD) | ✅ | ❌ | ❌ | ❌ |
| Lightweight & Open Source | ✅ | ❌ (Paid) | ❌ (Paid) | ✅ |
MITM Proxy is like Wireshark, but built for automation engineers! 🛠
🛠 Setting Up MITM Proxy with an Android/iOS Device
Step 1: Install MITM Proxy
If you’re on Mac, install it using Homebrew
brew install mitmproxy
For Windows/Linux, check the official installation guide.
Now, let’s fire up MITM Proxy so it can start listening for network requests:
mitmdump --listen-port 8090
This starts the proxy on port 8090 and captures ALL traffic.
To capture traffic only for a specific domain, run:
mitmdump --listen-port 8090 "example.com"
You can also use mitmproxy instead of mitmdump if you prefer an interactive UI.
Your phone needs to route all network traffic through MITM Proxy.
🔎 Find Your Private IP Address
We need the IP address of the machine running MITM Proxy.
Mac/Linux:
ifconfig | grep -i mask
Look for an IP that starts with 192.168.x.x.
Windows:
Open CMD and type:
ipconfig
Find your IPv4 Address under your active network connection.
For Real Devices:
1️⃣ Connect your phone to the same WiFi network as your laptop/PC.
2️⃣ Open WiFi Settings → Tap on your current network. (Connect your device to the same network as the device running proxy server)
3️⃣ Find "Proxy Settings" and set:
Connect your device to the same network as the proxy device
Open Network Settings -> Goto Wifi
Open Network Details
Edit connection and configure proxy settings, make sure to put the correct private IP Address and port
For Emulators:
If you’re using an emulator, start it with:
emulator -avd <EMULATOR_NAME> -http-proxy http://<YOUR_PRIVATE_IP>:8090
🚀 Now your device/emulator is sending network traffic through MITM Proxy!
Step 5: Intercept HTTPS Traffic (Important for Most Apps!)
🚨 By default, MITM Proxy only captures HTTP traffic. But most modern apps use HTTPS.
To capture secure API requests, we need to install the MITM CA Certificate.
📥 Install the MITM CA Certificate
For Android:
1️⃣ Open your mobile browser and go to mitm.it.
2️⃣ Download the MITM CA Certificate.
3️⃣ Install it via mitm.it:
Settings → Security → Encryption & Credentials → Install a Certificate → CA Certificate
4️⃣ Select VPN and Apps → Tap OK.
For iOS:
1️⃣ Visit mitm.it in Safari.
2️⃣ Download the CA Certificate.
3️⃣ Go to Settings → General → Profile → Install Certificate.
4️⃣ Enable Full Trust under Settings → General → About → Certificate Trust Settings.
Step 6: Make Your App Respect the Certificate (For Debugging Only!)
Android apps ignore user-installed certificates by default. If you're debugging, update network_security_config.xml:
<network-security-config xmlns:tools="http://schemas.android.com/tools">
<debug-overrides>
<trust-anchors>
<certificates src="system" />
<certificates src="user" />
</trust-anchors>
</debug-overrides>
</network-security-config>
🚨 Warning: NEVER do this in a production app!
🎯 What’s Next?
✅ MITM Proxy is set up!
✅ Your device is connected!
✅ You can now capture mobile API traffic! 🎉
👉 In Part 2, we’ll:
✅ Save intercepted requests to a log file.
✅ Filter traffic based on API endpoints.
✅ Use captured logs for debugging and automation reports.
Stay tuned! 🚀
💬 Questions? Thoughts? Drop a comment!
🔜 Coming up in Part 2: Saving logs & integrating with Appium! 🎯
