How to Fix Nginx Resource Domain CORS and 403 Forbidden Errors

When a main domain requests static assets from a separate resource domain, issues like CORS restrictions or 403 Forbidden errors caused by hotlink protection often arise. This article analyzes the root causes of these resource domain errors under Nginx. It provides step-by-step practical solutions including cross-origin header injection, Referer whitelist configurations, and HTTPS certificate validation to help developers quickly resolve asset loading faults.