301 Redirect
In one sentence
A permanent redirect, telling browsers and crawlers that a page has moved for good.
Analogy Mental model
A notice on the old shop door: we have moved permanently to this address, this location is closed.
In practice What you actually do
Use it for domain changes, URL restructuring, HTTP to HTTPS, and any consolidation where the old URL should stop existing. Point the old URL at the final destination, not the next hop, and check that the destination returns 200.
Where people get burned Pitfalls
Most of the signal transfers and not all of it, so a redirect is a repair rather than a move. Chains and loops compound the loss, and every hop adds latency for the visitor clicking the old link.
This entry was written in English from the Chinese original, not machine-translated. Read the Chinese version →