Using Proxyman
Last modified on Thu 01 Apr 2021

Before software can be reusable it first has to be usable.

About Proxyman

Proxyman is an HTTP proxy / HTTP monitor / Reverse Proxy that helps you to view, inspect, and manipulate all of the HTTP and HTTPS traffic between the app you are testing and the Internet.

Why Proxyman?

When to use Proxyman?

Let's say you have a circle chart that on a scale of 0-100% is displaying occupancy of some building. A chart is not only showing the correct value but it is changing color depending on it. If occupancy is between 0-60%, the value is green. If occupancy is between 60-80% value is yellow, and if occupancy is between 80-100% value is red.

Proxyman_charts.png

Since value depends on data received from sensors and you cannot simply change it, here is where Proxyman becomes very handy. Setting a breakpoint and intercepting a call you can manually change and test some specific cases such as:

Proxyman on MacBook

To install Proxyman on your Mac just download the latest version from here.

Certificate install

After installation, you are required to install a certificate on your Mac:

  1. Open Proxyman
  2. Click on the "Certificate" tab
  3. Click "Install Certificate on this Mac"
  4. Follow instructions and install Certificate

Once it is done, you will see that your certificate is installed & trusted.

Proxyman_crtificate.png

Breakpoint Tool

Breakpoint Tool (Breakpoints in Proxyman) is used for stoping a request before it goes to a server or for stoping a response before it goes to the app. To do that, Proxyman is using "Breakpoint rules". In rules, you define the API URL that you want to intercept and whether if you want to intercept a request or response. You can also name your rule so it is easier for you to find it later in the list of rules.

To use breakpoints, first you need to define the breakpoint rule.

  1. In toolbar click on Tools dropdown menu
  2. Click Brakepoint > Rules. Or you can access it by pressing ⌥ +⌘ + B Proxyman_brakepoint.png
  3. Click the "+" button (bottom left corner of the breakpoint rules screen)
  4. Add the name of the rule
  5. Enter the desired URL to the "Matching Rule" input field
  6. If you click "ANY", you can choose in between HTTP requests. Most of the time "ANY" would be just fine
  7. Select whether you want to use this rule for interception of your request, response or it can be used for both

Proxyman_rule_draft.png

Great, now you have a rule. If you click "+" you can add a new rule and create a list of rules. You can completely edit the existing rule by double-clicking on it or you can quickly enable/disable or change the request or response by clicking on the checkboxes of the desired rule in the list.

Proxyman_brakepoint_rules.png

Change of response

After you refresh the page in your app, Proxyman will open a breakpoint window that will show you "Request" and "Response" in JSON format. In Response on the right part of the screen, switch to the "Body" tab. In this example, we will edit the average utilization value. The initial value is 20, but we now want to see if the value of 89% is displayed correctly. Let's edit avgUtilization and set it to 89.

Proxyman_value_89.png

After editing, by clicking on the Execute button the edited response will be displayed in the app.

Proxyman_example_chart.png

Every time you want to apply a different value, you need to refresh the page, enter the desired value and execute the response.

TIP: After you finish, make sure that you either unselect breakpoints that you will not use anymore or delete them because as long as Proxyman is turned on and you are triggering this API call (some calls are automatically triggered every 30 sec) Proxyman will intercept it and the breakpoint window will be opened.

This was an example of manipulation with a response. In the same way, you can manipulate with a request.

Proxyman on iOS and Android devices

Before using Proxyman on your mobile device you need to install certificates and set up a proxy.

iOS device

  1. Open Proxyman on your Mac
  2. Click on the "Certificate" tab
  3. Click "Install Certificate on iOS"
  4. Click "Physical Devices"
  5. Follow instructions and configure Wifi Proxy on iOS device to Proxyman
  6. Follow instructions and install the Certificate on your iPhone

Android device

It differs from device to device but it can go something like this:

  1. Open Proxyman on your Mac
  2. Click on the "Certificate" tab
  3. Click "Install Certificate on Android"
  4. Click "Physical Devices"
  5. Follow instructions and configure Wifi Proxy on Android device to Proxyman
  6. Follow instructions and install the Certificate on your Android device (be careful, trusting Proxyman Certificate is different for Android 7+ and Android 11+ devices)

Once done, you can now add rules and start using Proxyman on your mobile devices.

Sharing the VPN from your Mac to your mobile device

Sometimes you'll be in a situation where you need to use a VPN on your mobile device and instead of setting up VPN on your mobile device, you can use Proxyman as a VPN sharing tool.

On your MAC

  1. Connect to a Wi-Fi network
  2. Connect to a proxy
  3. While holding the Option key (⌥), click the Wi-Fi icon in your Mac's status bar
  4. Remember the IP address

IP address

On your iPhone

  1. Open up Settings
  2. Tap on Wi-Fi
  3. Connect to the same network as the one you're connected to with your Mac
  4. Tap on configure proxy
  5. Tap on "Server" and write down your IP address (the one you remembered)
  6. Tap on "Port" and write down 9090

iOS proxy setup

On your Android

It differs from device to device but it can go something like this:

  1. Go to "Settings"
  2. Go to "Wifi" or "Network"
  3. Connect to the same network as the one you're connected to with your Mac
  4. Long tap on the Wifi network you are connected to
  5. Click the "Modify network" option
  6. Click "Show advanced options"
  7. Under "Proxy", change the option to "Manual"
  8. Tap on "Proxy hostname" and write down your Mac's IP address (the one you remembered)
  9. Tap on "Proxy port" and write down 9090

Android setup

Once you are done, you'll "share" the VPN from your Mac on your mobile device.


dil-robot.gif