PreventPreflight 101 Source/core/loader/DocumentThreadableLoader.cpp if ((m_options.preflightPolicy == ConsiderPreflight && isSimpleCrossOriginAccessRequest(request.httpMethod(), request.httpHeaderFields())) || m_options.preflightPolicy == PreventPreflight) { PreventPreflight 141 Source/core/page/EventSource.cpp options.preflightPolicy = PreventPreflight; PreventPreflight 315 Source/web/AssociatedURLLoader.cpp COMPILE_ASSERT_MATCHING_ENUM(WebURLLoaderOptions::PreventPreflight, PreventPreflight);