When using the `QueryParameterAttribute` to set a query parameter, it does not update the query string in the exchange, which makes things out of sync.  If you have a request like so:

 /myEndpoint?foo=bar

and run a handler like so:

set( attribute='%{q,baz}', value='bum') 

and the you dump the request, you'll see:

parameter=foo=bar
parameter=baz=bum
queryString=foo=bar

The query parameter map gets updated, but the exchange's query string is now out of sync.  This is problematic when using a servlet app with undertow that uses the query string directly as it does not see any of the added parameters.  Note, the `rewrite()` handler does not have this issue and takes care to update both the query parameters AND the query string.  However, it still does have other issues outlined in ticket UNDERTOW-2359