Fiddler and FiddlerCore by default use separate certificates and that's why FiddlerCore does not work out of the box in an environment setup for Fiddler.
First, you have to tell FiddlerCore to start decrypting HTTPS. Depending on the Startup method you use it is done differently, but it shouuld be pretty straightforward. The option you are looking for is "DecryptSSL".
Then you have to add FiddlerCore's root certificate to the keystore, which is one-time operation. The easiest way of doing it is the following:
1. Call CertMaker.trustRootCert() and trust the certificate.
2. Go to the Windows certificate store and export the certificate. If you want to capture the traffic only from Java app you should be fine also removing it.
3. Add the certificate to the Java keystore.
There is also way of exporting the certificate directly, but it is more complicated and need more code from your side, since the API to do it is not public. If you want to go this path, please, let me know and I will do my best to guide you through it.
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