| Header Name| Description| Required?| Notes|
| --- | --- | --- | --- | --- | --- | --- | --- |
| Cache| Cache Headers| yes| See https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.|
| x-xbl-errors| Errors| no| List of errors from various data providers.|
| x-xbl-traceid| Trace Id from logs| yes| Used to trace back the request specific logs.|
| x-server-name| Obfuscated name of the server that handles the request.| yes| Used for internal debugging.|