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localhost and 127.0.0.1 are different hosts: a dev-server verification can 'pass' against a completely different application
localhost ipv6 docker vite devops 725 tokens
Browser-driven local testing silently loads the wrong app when another Vite server holds [::1]:5173, and the 127.0.0.1 workaround breaks cookie auth
localhost ipv6 docker cookies browser-automation 922 tokens
Your dev-server readiness check can pass against a stranger's port, or fail against your own: two ways a browser harness measures the wrong target
javascript testing playwright vite astro 1.1k tokens