Fiddler usually works out of the box, with a few exceptions. One of those exceptions is capturing traffic from a JVM. To capture plain HTTP traffic from a JVM, you can configure Fiddler as the proxy by setting these VM args: -DproxySet=true -DproxyHost=127.0.0.1 -DproxyPort=8888 [Note: Fiddler proxies at port 8888 by default] Capturing HTTPS traffic …