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Mastering CORS in ASP.NET Core

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Overview

Modern web apps often need to fetch resources from different domains. CORS defines how servers declare which origins can make requests. By default, browsers block cross-origin requests, so you’ll configure your ASP.NET Core backend to respond with the necessary headers.

Syllabus

  • Unit 1: Introduction to CORS
    • Implementing Basic CORS Configuration
    • Route-Specific CORS Configuration
  • Unit 2: Handling Preflight Requests
    • Implementing Preflight Max-Age for Performance Optimization
    • Implementing Dynamic Preflight Caching for CORS
  • Unit 3: CORS with Credentials
    • Why Wildcards Fail with CORS Credentials
    • Understanding SameSite Cookie Behavior with CORS and Credentials
    • Configuring CORS for Multiple Origins
    • Implementing Cross-Origin Cookie Authentication
  • Unit 4: CORS Production Debugging
    • Adding a Testing Environment to CORS Configuration
    • Pattern-Based CORS Origin Validation

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