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+=================
+ Common Entities
+=================
+
+.. toctree::
+   :maxdepth: -1
+
+Bucket and Host Name
+--------------------
+There are two different modes of accessing the buckets. The first (preferred) method
+identifies the bucket as the top-level directory in the URI. ::
+
+	GET /mybucket HTTP/1.1
+	Host: cname.domain.com
+
+The second method identifies the bucket via a virtual bucket host name. For example::
+
+	GET / HTTP/1.1
+	Host: mybucket.cname.domain.com
+
+To configure virtual hosted buckets, you can either set ``rgw_dns_name = cname.domain.com`` in ceph.conf, or add ``cname.domain.com`` to the list of ``hostnames`` in your zonegroup configuration. See `Ceph Object Gateway - Multisite Configuration`_ for more on zonegroups.
+
+.. tip:: We prefer the first method, because the second method requires expensive domain certification and DNS wild cards.
+
+Common Request Headers
+----------------------
+
++--------------------+------------------------------------------+
+| Request Header     | Description                              |
++====================+==========================================+
+| ``CONTENT_LENGTH`` | Length of the request body.              |
++--------------------+------------------------------------------+
+| ``DATE``           | Request time and date (in UTC).          |
++--------------------+------------------------------------------+
+| ``HOST``           | The name of the host server.             |
++--------------------+------------------------------------------+
+| ``AUTHORIZATION``  | Authorization token.                     |
++--------------------+------------------------------------------+
+
+Common Response Status
+----------------------
+
++---------------+-----------------------------------+
+| HTTP Status   | Response Code                     |
++===============+===================================+
+| ``100``       | Continue                          |
++---------------+-----------------------------------+
+| ``200``       | Success                           |
++---------------+-----------------------------------+
+| ``201``       | Created                           |
++---------------+-----------------------------------+
+| ``202``       | Accepted                          |
++---------------+-----------------------------------+
+| ``204``       | NoContent                         |
++---------------+-----------------------------------+
+| ``206``       | Partial content                   |
++---------------+-----------------------------------+
+| ``304``       | NotModified                       |
++---------------+-----------------------------------+
+| ``400``       | InvalidArgument                   |
++---------------+-----------------------------------+
+| ``400``       | InvalidDigest                     |
++---------------+-----------------------------------+
+| ``400``       | BadDigest                         |
++---------------+-----------------------------------+
+| ``400``       | InvalidBucketName                 |
++---------------+-----------------------------------+
+| ``400``       | InvalidObjectName                 |
++---------------+-----------------------------------+
+| ``400``       | UnresolvableGrantByEmailAddress   |
++---------------+-----------------------------------+
+| ``400``       | InvalidPart                       |
++---------------+-----------------------------------+
+| ``400``       | InvalidPartOrder                  |
++---------------+-----------------------------------+
+| ``400``       | RequestTimeout                    |
++---------------+-----------------------------------+
+| ``400``       | EntityTooLarge                    |
++---------------+-----------------------------------+
+| ``403``       | AccessDenied                      |
++---------------+-----------------------------------+
+| ``403``       | UserSuspended                     |
++---------------+-----------------------------------+
+| ``403``       | RequestTimeTooSkewed              |
++---------------+-----------------------------------+
+| ``404``       | NoSuchKey                         |
++---------------+-----------------------------------+
+| ``404``       | NoSuchBucket                      |
++---------------+-----------------------------------+
+| ``404``       | NoSuchUpload                      |
++---------------+-----------------------------------+
+| ``405``       | MethodNotAllowed                  |
++---------------+-----------------------------------+
+| ``408``       | RequestTimeout                    |
++---------------+-----------------------------------+
+| ``409``       | BucketAlreadyExists               |
++---------------+-----------------------------------+
+| ``409``       | BucketNotEmpty                    |
++---------------+-----------------------------------+
+| ``411``       | MissingContentLength              |
++---------------+-----------------------------------+
+| ``412``       | PreconditionFailed                |
++---------------+-----------------------------------+
+| ``416``       | InvalidRange                      |
++---------------+-----------------------------------+
+| ``422``       | UnprocessableEntity               |
++---------------+-----------------------------------+
+| ``500``       | InternalError                     |
++---------------+-----------------------------------+
+
+.. _`Ceph Object Gateway - Multisite Configuration`: ../../multisite