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Host Header Missing

Your request did not include a valid Host header and was blocked by SCDN.

ERROR 1003 – Host Header Missing

The requested resource could not be matched to a valid site because the HTTP Host header was missing or invalid. A proper Host header is required so the edge and origin can determine which website you are trying to access.

💡 What you can try

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Request flow overview

SCDN received your request, but it did not contain a valid Host header, so the request was blocked before reaching the origin server.

Your device Browser / Client

SCDN Security Missing / invalid Host header

Origin server Request not routed without Host

🔧 Technical details (for site admin) – click to expand ▼

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