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cRest and getting HTTP QUERY PARAMETERS

How can I obtain a QUERY PARM from the headers.

 

Here is my URL: http://localhost:8040/?a=1&b=3&c=5

 

I tried logging this: ${header.a} and nothing showed up

 

I tried this in the cRest component : http://127.0.0.1:8040?a={a},c={c},b={b}  and CXFRS exception.

 

I tried logging this: ${header.http_query} and I get "{a=[1],b=[2],c=[3]}"

Thank you