Just noticed that for me (on ubuntu at least) the default provider sends a lot of stuff as well as the query!

{google:baseURL}search?q=%s&client=ubuntu&channel=cs&{google:RLZ}{google:originalQueryForSuggestion}{google:assistedQueryStats}{google:searchFieldtrialParameter}{google:searchClient}{google:sourceId}{google:instantExtendedEnabledParameter}{google:omniboxStartMarginParameter}ie={inputEncoding}