cors function
Implementation
FECallBackWithNext cors([CorsOptions? options]) {
options ??= CorsOptions();
return (Req req, Res res, Function next) {
if (req.method == 'OPTIONS') {
// Handle CORS preflight request
setCorsHeaders(res);
res.setStatusCode(HttpStatus.ok);
res.close();
return;
} else {
next();
}
};
}