download .gz file using extensioncallout policy from AWS S3

Can anyone please help me out with the flow for downloading a .gz file from AWS S3 bucket using an extension callout policy in the apigee. I'm getting the content in the callout response but unable to handle that response. Actually what I want is to download the .gz file from S3 using apigee proxy.

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I'm getting the content in the callout response but unable to handle that response.

What does it mean "unable to handle"?

What problem are you facing specifically?