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Get httpmon running and capturing traffic in under a minute.
1

Start httpmon

Launch the proxy. By default it listens on port 8080.
httpmon
You can specify a custom port with the --port flag.
httpmon --port 9090
2

Configure your proxy

Set your browser or application to use http://localhost:8080 as its HTTP proxy.Most browsers support proxy configuration in their network settings. You can also use environment variables for CLI tools.
export http_proxy=http://localhost:8080
export https_proxy=http://localhost:8080
3

Browse and inspect

Open a website or make a request. Flows appear in the TUI as they arrive.Use j and k to navigate the flow list. Press Enter to open the detail inspector for any flow.
httpmon first flow

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Enable HTTPS interception

By default, httpmon only intercepts plain HTTP traffic. To intercept HTTPS, you need to trust the httpmon CA certificate. 
sudo httpmon --install-ca
This generates a CA certificate (if one does not exist yet) and adds it to your system trust store. See CA certificate setup for manual installation steps and browser-specific instructions.