Parameters for suggest URL which uses POST

If DefaultSearchProviderEnabled is on, then setting DefaultSearchProviderSuggestURLPostParams specifies the parameters during suggestion search with POST. It consists of comma-separated, name-value pairs. If a value is a template parameter, such as '{searchTerms}', real search terms data replaces it. Leaving DefaultSearchProviderSuggestURLPostParams unset unset means suggest search requests are sent using the GET method. Example value: q={searchTerms},ie=utf-8,oe=utf-8