Unable to create and test service connection with query parameter

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My REST integration has a URL which ends in:

rest/TEMP_RJR_WITH_PARM/1.0/geturl?OrderID=[OrderID-value]

When creating a service connection in VBCS, I am pasting the entire URL.  On the Request page, I add a dynamic URL query paramater named OrderID, define it as a number, leave the default value blank and mark it as required.  I go to run a test and populate the query parameter with a valid value, but the response always comes back blank "".  My tracking integration even shows as receiving "OrderID-value" as the parameter.  I then change the Path when testing the service connection to "/geturl?OrderID=123456" where 123456 is a valid value.  The test is successful and I can see the