// Adds the built-in HTTP-specific datasources.
func (h *CookooHandler) addDatasources(cxt cookoo.Context, req *http.Request) {
parsedURL := req.URL
urlDS := new(URLDatasource).Init(parsedURL)
queryDS := new(QueryParameterDatasource).Init(parsedURL.Query())
formDS := new(FormValuesDatasource).Init(req)
pathDS := new(PathDatasource).Init(parsedURL.Path)
headerDS := new(RequestHeaderDatasource).Init(req)
cxt.AddDatasource("url", urlDS)
cxt.AddDatasource("query", queryDS)
// cxt.AddDatasource("q", queryDS)
cxt.AddDatasource("post", formDS)
cxt.AddDatasource("path", pathDS)
cxt.AddDatasource("header", headerDS)
}