HTTP 306 Unused

What this status code means

Do not rely on this code in modern implementations.

Who should act first

Routing and canonicalization rules are usually responsible for behavior.

What to check first

• Inspect Location header correctness.
• Check redirect chain depth and loops.
• Validate permanent vs temporary intent.

How it differs from similar codes

• HTTP 301 Moved Permanently — full guide
• HTTP 302 Found — full guide
• HTTP 307 Temporary Redirect — full guide
• HTTP 308 Permanent Redirect — full guide

Reference and next step

Specification: RFC 9110.

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