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Content-Security-Policy connect-src versus CORS: two layers that must agree
connect-src blocks fetch to disallowed hosts before CORS runs; fixing CORS alone will not unblock a CSP violation.
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cspsecuritycors
Developer confusion
Console may show CSP errors alongside CORS failures; triage CSP first when the blocked URL is not your API host.
Use nonce or hash scripts carefully—inline fetch wrappers still need connect-src approval.
Staging parity
Mirror production CSP headers in preview deployments so CORS tests are meaningful.
Document required connect-src entries for each third-party SDK your SPA loads.