AI BriefingNext.js Troubleshooting: From Root Cause to Fix for CORS and Version Skew Errors
Key point
Shares hands-on experience analyzing and resolving CORS errors and Version Skew issues occurring in a Next.js SSR environment.
Details
While developing KakaoPay's money charging service, unexpected CORS errors and page refresh phenomena occurred in a Next.js(v13, Pages Router)-based SSR environment.
As a result of error analysis, the cause was found in differences in CSS file request methods. When a page is first loaded via SSR, a normal request without an Origin header occurs, but during Client-side navigation, a CORS request including the Origin header occurs through the fetch API.
At this point, if a response without an ACAO(Access-Control-Allow-Origin) header is cached in the browser, subsequent requests of the fetch type violate CORS policy and cause errors.
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