ASPNET CORS Deep Dive — Cross-Origin Resource Sharing in .NET
DodaTech
Updated 2026-06-28
1 min read
In this tutorial, you'll learn about ASPNET Cors Deep. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.
CORS in ASP.NET Core controls how your API responds to cross-origin requests from browser-based applications.
builder.Services.AddCors(options =>
{
options.AddPolicy("SpecificOrigins", policy =>
{
policy.WithOrigins("https://app.example.com", "https://admin.example.com")
.AllowAnyMethod()
.AllowAnyHeader()
.WithExposedHeaders("X-Scan-Result", "X-RateLimit-Remaining")
.SetPreflightMaxAge(TimeSpan.FromMinutes(10));
});
options.AddPolicy("AllowAll", policy =>
{
policy.AllowAnyOrigin()
.AllowAnyMethod()
.AllowAnyHeader();
});
});
app.UseCors("SpecificOrigins");
[EnableCors("SpecificOrigins")]
public class ScanController : ControllerBase { ... }
Explicit CORS policies prevent unauthorized cross-origin access while supporting legitimate frontend applications.
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ASPNET Authorization Policies — Fine-Grained Access Control in .NET
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ASPNET Caching — Response and Output Caching in ASP.NET Core
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