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I have a Jmeter script ready for checking performance of webapp, Before i send the actual http request to measure performance, i want to send another http request to set some value. How do set the http request to set some values in Jmeter?

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Normally people use setUp Thread Group for any precondition actions.

If for some reason this is not applicable for your scenario - you can consider using JSR223 PreProcessor and Apache HttpComponents API to send a custom HTTP Request prior to the JMeter's one. The time taken by PreProcessors, PostProcessors and Timers is not included into the sampler's "Elapsed Time".

See How to Load Test AJAX/XHR Enabled Sites With JMeter for some reference Groovy code, but keep in mind you need PreProcessor, not the PostProcessor.

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