By extracting static values into dynamic parameters, you can easily change URLs, request body, and headers across all requests. This can be very useful when recording a test scenario in one environment, and running it on another.
To extract a string into a parameter, click the
EXTRACT PARAMETER button at the top of the test editor. Set the parameter name and the value for extraction, and click the EXTRACT button (For large tests, this can take a few seconds).
This trick can be also very useful to set authentication and CSRF headers across all requests.