Using ExtractVariable policy to extract HTTP header and printing on console using JavaScript

[ramgkrishnancer]

Hi,

I'm very new to APIGEE and have been going through 4MV4D by Anil to try out some scenarios. My scenario is very simple.

I have created a "Reverse Proxy" and mapped it to httpbin.org/get as target. I'm trying to use ExtractVariable policy to extract the "Content-Encoding" HTTP header and use a JavaScript policy to print to the console.

Here's my code from "ExtractVariable" policy:

....

<Header name="Content-Encoding">  
    <Pattern ignoreCase="true">CE {response.header.Content-Encoding}</Pattern>  
</Header>
<Source clearPayload="false">response</Source>

....

This is what I'm using to print to the console using JavaScript

print(context.getVariable("CE"));

Both the "ExtractVariable" policy and JavaScript policy is applied to the response path of the Pre-Flow.

The proxy executes successfully and I get a 200 OK and a successful response back in the browser, however, I'm seeing null being printed on the console.

What am I missing here? Can anyone please suggest?