Results code for errors are not complete about docs HOT 2 CLOSED

404: If the collection-name is unknown, then a HTTP 404 is returned.

Not sure what unknown is supposed to mean in this context, it seems to belong to another HTTP method (GET .../_api/collection/{name} -> 404 collection or view not found)

Empty POST body as well as invalid collection name leads to 404 illegal name. The 400 missing name error can not be triggered it seems...

Conflict with existing collection leads to 409 duplicate name

Docs look outdated but also partially broken?

from docs.

Recent changes to error codes:

• Changed HTTP return code for an error case in /_api/cluster/endpoints REST API.
  Now, if the API is called on a single server, it will return HTTP 501 instead
  of HTTP 403 (https://github.com/arangodb/arangodb/pull/10743/files / https://github.com/arangodb/arangodb/pull/10664/files ?)
• Changed HTTP return code for an error case in /_api/cluster/agency-dump REST API.
  Now, if the API is called on a server type other than coordinator, it will return
  HTTP 501 instead of HTTP 403. (Endpoint apparently not documented)
• The General Graph document API is now consistent with the document API in its error messages.
  When attempting to create / modify edges pointing to non existing vertex collections
  HTTP 400 is returned instead of 404.
• more?

from docs.