Blog

Mert Özen's blog posts on software development, backend, frontend, and DevOps.

Series

.NET Core Web API 36 Angular 31 JavaScript Basics 19 JavaScript Intermediate 18 JavaScript Advanced 16 TypeScript Basics 14 TypeScript Intermediate 14 TypeScript Advanced 12

2 posts found #cors

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Backend PART 24

CORS and Security in ASP.NET Core Web API: HTTPS, HSTS, Headers and Secrets

We see with curl why CORS is not a firewall, define a policy and read the preflight request. HTTPS redirection, the localhost exception in HSTS, security headers and user secrets are covered too.

4 Nov 2026 8 min 1

Frontend PART 11

JavaScript Fetch API: GET, POST, response.ok, Timeouts and an Intro to CORS

We fetch and send data with the Fetch API and see why a 404 skips catch, how response.ok helps, POST/PUT/DELETE, timeouts with AbortSignal.timeout, CORS, and showing loading and error states.

3 Nov 2026 9 min 6