HTTP 101 Switching Protocols vs 423 Locked
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 423 (Locked) is a 4xx Client Error response. 101 indicates that the server understands the Upgrade header field request and indicates which protocol it is switching to. In contrast, 423 means that the resource is locked and cannot be modified (WebDAV).
Description
The server understands the Upgrade header field request and indicates which protocol it is switching to.
When You See It
When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
How to Fix
This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
Description
The resource is locked and cannot be modified (WebDAV).
When You See It
When trying to edit a file that another user has locked in WebDAV.
How to Fix
Wait for the lock to be released, or request the lock owner to unlock it.
Key Differences
101 is a 1xx Informational response, while 423 is a 4xx Client Error response.
HTTP 101: The server understands the Upgrade header field request and indicates which protocol it is switching to.
HTTP 423: The resource is locked and cannot be modified (WebDAV).
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 423 when when trying to edit a file that another user has locked in WebDAV.
When to Use Which
For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 423 (Locked): Wait for the lock to be released, or request the lock owner to unlock it.