301
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ELI5 — The Vibe Check
301 Moved Permanently means 'this URL has moved forever — update your bookmarks.' It's the server politely telling you to go somewhere else permanently. Browsers remember 301s and go straight to the new URL next time.
Real Talk
HTTP 301 Moved Permanently is a redirect response indicating the requested resource has permanently moved to a new URL provided in the Location header. Browsers and search engines cache this redirect, which is important for SEO.
When You'll Hear This
"Set up a 301 redirect from the old domain." / "301 redirects pass SEO link equity to the new URL."