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The bypass middleware for OPTIONS requests is added after cookieParser and JSON parsing, causing unnecessary processing on preflight requests. Consider moving it before these middlewares to short-circuit earlier.
// Bypass auth and CSRF for OPTIONS requestsapp.use((req: Request,res: Response,next: NextFunction)=>{if(req.method==="OPTIONS"){res.status(204).send("");// Ensure preflight requests return 204return;}next();});
Invoke the CORS middleware in your OPTIONS bypass so the response includes proper CORS headers. Wrap the handler in cors(corsOptions) and use res.sendStatus(204) for clarity.
Why: Wrapping the OPTIONS handler in the cors(corsOptions) middleware ensures the preflight response includes the proper CORS headers, which is essential for compliant cross-origin requests.
Medium
Auto-handle CORS preflight
Extend the CORS options to let the middleware auto-respond to preflight requests with a 204 status, avoiding a custom bypass. Add optionsSuccessStatus and preflightContinue so CORS handles OPTIONS before auth/CSRF middleware.
Why: The suggestion correctly leverages optionsSuccessStatus and preflightContinue on the corsOptions to simplify preflight handling and remove the custom bypass, improving maintainability and security.
Medium
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User description
PR Type
Enhancement
Description
Add HTTP methods to CORS options
Remove explicit preflight handler
Bypass auth and CSRF on OPTIONS
Retain CORS and session validation
Changes walkthrough 📝
server.ts
Update CORS options and OPTIONS middlewarefunctions/src/server.ts
corsOptionsapp.options("*", cors(...))preflight handler