HTTP 421 Misdirected Request vs 530 Site Frozen
HTTP 421 (Misdirected Request) is a 4xx Client Error response, while 530 (Site Frozen) is a 5xx Server Error response. 421 indicates that the request was directed at a server that is unable to produce a response for the combination of scheme and authority in the URI. In contrast, 530 means that cloudflare-specific. Used by Pantheon hosting to indicate a frozen site.
Description
The request was directed at a server that is unable to produce a response for the combination of scheme and authority in the URI.
When You See It
With HTTP/2 when a connection is reused for a domain the certificate doesn't cover.
How to Fix
Retry the request on a new connection.
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
421 is a 4xx Client Error response, while 530 is a 5xx Server Error response.
HTTP 421: The request was directed at a server that is unable to produce a response for the combination of scheme and authority in the URI.
HTTP 530: Cloudflare-specific. Used by Pantheon hosting to indicate a frozen site.
You encounter 421 when with HTTP/2 when a connection is reused for a domain the certificate doesn't cover.
You encounter 530 when when a site on Pantheon hosting has been frozen due to inactivity.
When to Use Which
For 421 (Misdirected Request): Retry the request on a new connection. For 530 (Site Frozen): Reactivate the site on the hosting platform.