rawResponseData is null in a LoadTest

Hi,

I have a TestCase containing a REST Step and Groovy Script Step.

The REST Step return a picture (Content-Type: image/png)

The script needs to get the full response of the first REST step, including headers, as a byte array. (because i'am using a library later)

This is the beginning of the scritp :

def image = testRunner.testCase.testSteps['getGrid'].testRequest.response.rawResponseData
log.info(image)

The test suite works fine on a unitary launch.

But when i create a LoadTest the script step fail because image var is null.

Is there an other way to get the rawResponseData ?

Thanks & Regards