How to set CORS policies in ASP.NET Core

Short answer: Configure in Startup.cs or Program.cs: services.AddCors(options => { options.AddPolicy("AllowSpecificOrigin", builder => { builder.WithOrigins(" .AllowAnyHeader() .AllowAnyMethod(); }); }); Enable middleware: app.UseCors("AllowSpecificOrigin");

Real-world example (ShopNest)

A ShopNest checkout request flows through middleware, hits a minimal API or controller, uses scoped services, and returns ProblemDetails on errors.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.