Document wildcard TLS certificate requirement for sandbox preview URLs#28315
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ghostwriternr merged 1 commit intoproductionfrom Feb 13, 2026
Merged
Document wildcard TLS certificate requirement for sandbox preview URLs#28315ghostwriternr merged 1 commit intoproductionfrom
ghostwriternr merged 1 commit intoproductionfrom
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Universal SSL only covers first-level wildcards. Workers deployed on subdomains produce second-level wildcard preview URLs that need either ACM, a custom certificate, or deploying on the apex domain.
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whoiskatrin
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Feb 13, 2026
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Workers deployed on a subdomain (e.g.,
sandbox.yourdomain.com) produce second-level wildcard preview URLs (*.sandbox.yourdomain.com) that Universal SSL doesn't cover. This causes TLS handshake failures with no actionable guidance in the docs — the troubleshooting section just said "wait a few minutes."Adds a caution callout to the production deployment guide with three options (apex domain, ACM, or a free Let's Encrypt cert), and fixes the preview URLs concept page which implied TLS is always automatic.