In Karate API mocking not working as expected for me

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Karate cannot automatically intercept calls.

The recommended approach is when you boot the application running at localhost:8080 you change the configuration so that instead of calling http://dev-stg/userservice/v1/findUser it calls something like http://localhost:8001/v1/findUser. This is what most teams do, and is easy because you should anyway be defining external URL-s as application.properties (or equivalent) as a best-practice.

It is very easy to over-ride an application property in Spring Boot for example, you can do this via the command-line: https://stackoverflow.com/a/37053004/143475

If you want, you can dynamically provision a port for the mock. So your unit test can first start a mock, get the port, and then start the server. You can find details in the Karate documentation.

All this said, if you are able to change the (system) HTTP proxy before the app at localhost:8080 starts, you may be able to do this without modifying the configuration. (But it is tricky, so I recommend the approach explained above.) So in this case, Karate can actually “intercept” the outgoing HTTP calls that the app at localhost:8080 makes.

See the second-last row (5a) in the table here: https://github.com/intuit/karate/tree/master/karate-netty#consumer-provider-example

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