HTTP 507 Insufficient Storage vs 520 Web Server Returned an Unknown Error
Both HTTP 507 (Insufficient Storage) and 520 (Web Server Returned an Unknown Error) belong to the 5xx Server Error category. 507 indicates that the server is unable to store the representation needed to complete the request (WebDAV). Meanwhile, 520 means that cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
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.
Description
Cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
When You See It
When Cloudflare receives an empty, unknown, or malformed response from the origin.
How to Fix
Check origin server logs. Ensure responses include proper headers. Verify SSL configuration.
Key Differences
HTTP 507: The server is unable to store the representation needed to complete the request (WebDAV).
HTTP 520: Cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
You encounter 507 when when the server runs out of disk space during WebDAV operations.
You encounter 520 when when Cloudflare receives an empty, unknown, or malformed response from the origin.
When to Use Which
For 507 (Insufficient Storage): Free up disk space on the server or increase storage capacity. For 520 (Web Server Returned an Unknown Error): Check origin server logs. Ensure responses include proper headers. Verify SSL configuration.