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CodeSignal

Enabling & Customizing CORS in Your TypeScript REST API

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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 Express server to respond with the necessary headers.

Syllabus

  • Unit 1: Introduction to CORS & Basic Setup
    • Implementing Basic CORS Security
    • Route Specific CORS Configuration
  • Unit 2: Handling Preflight (OPTIONS) Requests & Methods
    • Route Specific Preflight CORS Configuration
    • Dynamic Preflight Cache Optimization Strategy
  • Unit 3: Cross-Origin Cookie Authentication with CORS Credentials
    • Why Wildcards Break Cookie Authentication
    • Understanding SameSite Cookie Behavior with CORS
    • Configuring Multiple Origins for CORS Authentication
    • Building a Complete Cookie Authentication System
  • Unit 4: Production Considerations & Debugging
    • Adding a Testing Environment to CORS
    • Pattern Based CORS Origin Validation

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