HTTP 426 Upgrade Required vs 507 Insufficient Storage
HTTP 426 (Upgrade Required) is a 4xx Client Error response, while 507 (Insufficient Storage) is a 5xx Server Error response. 426 indicates that the server refuses to perform the request using the current protocol but might after the client upgrades to a different protocol. In contrast, 507 means that the server is unable to store the representation needed to complete the request (WebDAV).
Description
The server refuses to perform the request using the current protocol but might after the client upgrades to a different protocol.
When You See It
When a server requires HTTPS or a newer protocol version.
How to Fix
Switch to the protocol specified in the Upgrade response header.
Description
The server is unable to store the representation needed to complete the request (WebDAV).
When You See It
When the server runs out of disk space during WebDAV operations.
How to Fix
Free up disk space on the server or increase storage capacity.
Key Differences
426 is a 4xx Client Error response, while 507 is a 5xx Server Error response.
HTTP 426: The server refuses to perform the request using the current protocol but might after the client upgrades to a different protocol.
HTTP 507: The server is unable to store the representation needed to complete the request (WebDAV).
You encounter 426 when when a server requires HTTPS or a newer protocol version.
You encounter 507 when when the server runs out of disk space during WebDAV operations.
When to Use Which
For 426 (Upgrade Required): Switch to the protocol specified in the Upgrade response header. For 507 (Insufficient Storage): Free up disk space on the server or increase storage capacity.