2-6-6-6

The term "2-6-6-6" typically refers to the HTTP response code that occurs when a server implementing the Distributed Authoring and Versioning (DAV) extension to HTTP encounters too many binds. This error indicates the server has exceeded its configured limit for the number of URI bindings that can be established simultaneously. In essence, a client is attempting to create more relationships between resources on the server than the server is configured to handle.

The 2-6-6-6 code itself is not a standard, officially registered HTTP status code. Instead, it falls within the range of "2xx" codes, which generally signify successful operations. However, because it's a non-standard code, its specific interpretation and implementation may vary across different DAV servers. Some servers might choose to use a different, more standard HTTP status code to indicate a similar issue, such as a 507 (Insufficient Storage) if the binding limit is related to storage constraints or a 423 (Locked) if the resources are locked preventing new bindings.

When encountered, a 2-6-6-6 response usually means the client needs to reduce the number of concurrent bind requests it's making. This could involve modifying the application to batch requests differently or implementing throttling mechanisms to avoid overwhelming the server. Diagnosing the root cause often requires examining server logs to understand the specific constraints that triggered the error. Because it's a non-standard code, client applications might need to be specifically programmed to recognize and handle it.