HTTP 501 Not Implemented vs 530 Site Frozen
Both HTTP 501 (Not Implemented) and 530 (Site Frozen) belong to the 5xx Server Error category. 501 indicates that the server does not support the functionality required to fulfill the request. The server either does not recognize the request method or lacks the ability to fulfill it. Meanwhile, 530 means that cloudflare-specific. Used by Pantheon hosting to indicate a frozen site.
Description
The server does not support the functionality required to fulfill the request. The server either does not recognize the request method or lacks the ability to fulfill it.
When You See It
When using an HTTP method (like PATCH) that the server doesn't support.
How to Fix
Use a different HTTP method that the server supports. Check server documentation.
Description
Cloudflare-specific. Used by Pantheon hosting to indicate a frozen site.
When You See It
When a site on Pantheon hosting has been frozen due to inactivity.
How to Fix
Reactivate the site on the hosting platform.
Key Differences
HTTP 501: The server does not support the functionality required to fulfill the request. The server either does not recognize the request method or lacks the ability to fulfill it.
HTTP 530: Cloudflare-specific. Used by Pantheon hosting to indicate a frozen site.
You encounter 501 when when using an HTTP method (like PATCH) that the server doesn't support.
You encounter 530 when when a site on Pantheon hosting has been frozen due to inactivity.
When to Use Which
For 501 (Not Implemented): Use a different HTTP method that the server supports. Check server documentation. For 530 (Site Frozen): Reactivate the site on the hosting platform.