Error when performing - GET - null while performing GET_REQUESTS

Error when performing - GET - null while performing GET_REQUESTS

I am writing a script to get all new and assigned requests from the system. After going through the documentation and various posts, I have come up with below request to format.

However I am getting the following result using a web browser to open the URL. Could someone help with it?

This XML file does not appear to have any style information associated with it. The document tree is shown below.
<operation name="GET">
<result>
<status> Failed </status>
<message> Error when performing - GET - null </message>
</result>
</operation>


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