About The Expect: 100-Continue Header And Write; About Replicate On Write; Named Object Write Details; Unnamed Object Write Details - Dell DX6000 Application Manual

DX Storage makes no assumptions about User-Agent (except that it is an HTTP/1.1 client). The
Host header is mandatory and must conform to the requirements of
spec.

6.1.1. About the Expect: 100-continue Header and WRITE

The Expect: 100-continue header
header lines and before sending the content stream in the body of the message. The DX Storage
server can respond with a redirect, an error response, or if it is capable and ready to store the
contents, it returns a 100 Continue response, telling the client to proceed with its transmission of the
entity body. The client should wait for a 100 Continue response from the server before proceeding
to send data. Otherwise, the server might send a 413 (Request entity too large error
response) and close the connection.
DX Storage allows the client to omit the Expect: 100-continue header, sending all the content data
at once, in which case the server reads and discards all data if it must respond with a redirect
or error. For WRITEs of more than 65536 bytes, DX Storage logs the following warning if the
Expect header is not utilized: Please use Expect: 100-continue for large amounts
of data. Additionally, if no node in the cluster has enough space to write the stream, a 507 -
Insufficient Storage error response is returned.

6.1.2. About Replicate On Write

To force a first replication by DX Storage on receipt of the file, set the query argument:
replicate=immediate. The value is case-sensitive, and all other values for replicate other
than immediate are ignored. If either the replication or the initial write fail, both will fail, and the
application returns a 412 error. This feature guarantees that two copies of the stream will be saved
on different nodes before returning a 201 Created.

6.2. Named Object WRITE Details

In contrast to an unnamed object, if you WRITE a named object that already exists, the existing
object is overwritten with a new version.

6.3. Unnamed Object WRITE Details

If you WRITE an unversioned stream, a new stream is created and a new UUID is returned. If you
WRITE an anchor stream, a new stream is created and a new alias UUID is returned.
To create unnamed anchor stream objects, alias=yes is required, as shown in the following
example.
POST /?alias=yes HTTP/1.1
Host: cluster.example.com
User-Agent: DX Storage Client/0.1

6.4. Normal Responses to WRITE

For a list of response headers, see
The following responses can be returned by the DX Storage cluster in the case where the new
content stream can be created as requested. The content might be created and written to the cluster
by the node to which the request was sent, or it might be redirected to another node in the cluster.
HTTP/1.1 201
Created Date: Wed, 1 Sept 2010 15:59:02 GMT
Copyright © 2010 Caringo, Inc.
All rights reserved
tells the server that the client will wait after sending just the
Section 4.6, "Normal Response
28
Section 14.23 of the HTTP/1.1
Headers".
December 2010
Version 5.0