How to read parameters from request object

We want to read parameters from GET request
but whenever we are calling GET_URI_PARAMETER from the REQUEST we don't see any results
url is like
http://coevi116.wdf.sap.corp:8000/sap(bD1lbiZjPTEwMA==)/bc/bsp/sap/z_test_json/jsontest.htm?PARAM=ABC
But reading PARAM is not givng value of ABC
onCreate and onRequest wherever we put the code it is not reading the value
Can anyone please help and share some expert opinion

in jsontest.htm page create a page attribute named "PARAM" with auto check box checked and check in oninitialization, this will carry the value passed to param from url.

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