for _, k := range keys {
		if isInternalHeader(k) {
			continue
		}
		result = append(result, k)
	}
	return result
}

// TranslateHeadersOperations translates headers operations
func TranslateHeadersOperations(headers *networking.Headers) HeadersOperations {
	req := headers.GetRequest()
	resp := headers.GetResponse()

		Match:    istio_route.TranslateRouteMatch(virtualService, match, true),
		Metadata: util.BuildConfigInfoMetadata(virtualService.Meta),
	}
	authority := ""
	if in.Headers != nil {
		operations := istio_route.TranslateHeadersOperations(in.Headers)
		out.RequestHeadersToAdd = operations.RequestHeadersToAdd
		out.ResponseHeadersToAdd = operations.ResponseHeadersToAdd
		out.RequestHeadersToRemove = operations.RequestHeadersToRemove