how to Capture https with fiddler, in java

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Create a keystore containing the Fiddler certificate.
Use this keystore as the truststore for the JVM along with the proxy settings.

Here’s how to do that:

  • Export Fiddler’s root certificate

Tools -> Fiddler Options… -> HTTPS -> Export Root Certificate to Desktop

  • Create a keystore with this certificate

Open command line as administrator (keytool doesn’t work otherwise)

<JDK_Home>\bin\keytool.exe -import -file C:\Users\<Username>\Desktop\FiddlerRoot.cer -keystore FiddlerKeystore -alias Fiddler

Enter a password when prompted. This should create a file called FiddlerKeystore.

  • Now start the JVM with Fiddler as the proxy and this keystore as the truststore. You’ll need these vmargs:

-DproxySet=true

-DproxyHost=127.0.0.1

-DproxyPort=8888

-Djavax.net.ssl.trustStore=<path\to\FiddlerKeystore>

-Djavax.net.ssl.trustStorePassword=<Keystore Password>

Use these vmargs in your eclipse run configuration and you should be good to go.

I’m able to capture HTTPS requests made from the JVM without any issues with this setup.

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