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Playwright: extra HTTP headers, CORS, and reliable integration tests for browser APIs
Inject Origin and custom headers in Playwright to mimic SPA traffic; assert both preflight and main response headers.
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playwrighttestingcors
Test design
Use request interception sparingly; prefer hitting real endpoints with controlled fixtures.
Snapshot failure messages when Access-Control-Allow-Origin is missing to speed up triage.
CI parallelism
Shard Playwright workers per browser project; WebKit catches Safari-specific CORS quirks.
Cache install browsers in CI to keep feedback loops under ten minutes.