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Testing CORS with Playwright: real browser coverage for your API
Use Playwright to launch Chromium and assert network responses include expected CORS headers from your app origin.
1 min read
testingplaywrightcors
Test design
Host a static page on localhost that calls your API; run Playwright against both dev and preview URLs.
Assert response headers in route.on('response') to validate preflight and main flows.
CI integration
Cache Playwright browsers in CI to keep pipelines fast.
Run CORS suites on pull requests that touch gateway or proxy configuration.