HTTP 101 Switching Protocols vs 424 Failed Dependency
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 424 (Failed Dependency) 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, 424 means that the request failed because it depended on another request that failed (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 request failed because it depended on another request that failed (WebDAV).
When You See It
In batch WebDAV operations when a prerequisite action fails.
How to Fix
Fix the failed dependency first, then retry the operation.
Key Differences
101 is a 1xx Informational response, while 424 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 424: The request failed because it depended on another request that failed (WebDAV).
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 424 when in batch WebDAV operations when a prerequisite action fails.
When to Use Which
For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 424 (Failed Dependency): Fix the failed dependency first, then retry the operation.