What it means
The server is switching to the protocol the client asked for. Informational responses are interim. The client should keep waiting or continue.
Common causes
WebSocket upgrades.
How to fix it
If WebSockets fail, check proxy settings allow Upgrade and Connection headers.
If you are a visitor
Nothing is wrong. Your browser handles this response automatically.
If you own the site
Nothing to retry. Search engines do not index 1xx responses; they wait for the final status. Run the HTTP status checker to see exactly what your URL returns, and use uptime monitoring to be told when it changes.
Frequently asked questions
What does HTTP 101 mean?
Switching Protocols: The server is switching to the protocol the client asked for.
Is HTTP 101 an error?
No. Informational responses are interim. The client should keep waiting or continue.
Does HTTP 101 affect SEO?
Search engines do not index 1xx responses; they wait for the final status.
Should I retry after HTTP 101?
Nothing to retry.