# How to monitor http/https traffic in JVM

## Download Fiddler

[Download Fiddler - the Free Web Debugging Proxy](https://www.telerik.com/fiddler)

## JVM (VM) settings

```
-DproxySet=true -DproxyHost=127.0.0.1 
-DproxyPort=8888 
-Djavax.net.ssl.trustStore="C:\Windows\System32\FiddlerKeystore" 
-Djavax.net.ssl.trustStorePassword="YourFiddlerKeyStorePassword"
```

## Generate Fiddler certificate

- Check to *Tools > Options > HTTPS > Decrypt HTTPS traffic*
- Go to `http://127.0.0.1:8888/` and download **FiddlerRoot Certificate**

## Create a JVM keystore, using the certificate

- Run `"C:\Program Files\Java\jdk1.8.0_144\bin\keytool.exe" -import -file "C:\Users\YourUserName\Desktop\FiddlerRoot.cer" -keystore FiddlerKeystore -alias Fiddler
- Provide a password
- Keystore will be generated in `C:\Windows\System32\FiddlerKeystore`

## Enable JVM proxy and provide keystore using the configuration above

- In IntelliJ Idea: *Run/Debug Configurations > VM options*