When you perform a record of your scenario, Neoload records the requests and responses exchanged between your browser and your web server.
This requests contain some parameters that are valid for that recording. Some parameters are created by the server and change each time the scenario is run.
To be able to simulate this behavior perfectly, the dynamic parameter returned by the server needs to be extracted (usually from a hidden form field or a link) and replaced in the following requests, such as a POST request.
The extraction is done using a variable extractor. Select the request, click on the "Advanced" button, then select "Variable extractor".
For more information, see "Variable Extractors" under "Design" section in Neoload documentation.
