get the Response time of a REST webservice call through Groovy

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Is there any way to get the response time of a Rest web service (GET/PATCH/POST) call through groovy.

For example, for get transaction, we are using the below line for GET through groovy. 

def response = adf.webServices.getTransaction.GET(sourceTrxNumber, 'OBSOLETED', 'CSP')

the variable response gives the response for the get Transaction but this does not contain the response time. We need to know the time taken for the get Operation.

Any suggestions?