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Chapter 1. Introduction

The SCSP Proxy accepts HTTP requests from a host network, forwards them to a DX Storage

cluster, handles redirects transparently, and then supplies the response back to the requestor. In

many deployments, a DX Storage cluster might be isolated on an internal network, protecting it from

undesired interaction with the host network, and also protecting the host network from services like

PXE boot and multicast traffic that can interfere with other network resources.

This reverse proxy can serve several other purposes as well, both in production deployments and in

test environments.

Specifically, the SCSP Proxy supports the following types of interactions:

• Basic SCSP Proxy for a local cluster

• Remote cluster coordination and communication

• Validation of incoming client requests for proper syntax and formatting

In a local cluster deployment, the SCSP Proxy handles all local SCSP traffic and manages the

associated communication with the local DX Storage cluster. The SCSP Proxy listens for any

inbound SCSP communications on the configured port and determines which DX Storage node to

send the initial request to.

For optimal performance, the SCSP Proxy caches open connections to DX Storage for reuse.

For more information, see one of the following sections:

•

Section 1.1.1, "Getting a List of DX Storage Cluster IPs"

•

Section 1.1.2, "About Expect: 100-continue Behavior"

•

Section 1.1.3, "About Location Headers"

The SCSP Proxy intercepts GET / and HEAD / requests and responds with information it stores

internally about itself and about the cluster for which it serves as a forward proxy. Only GET / and

HEAD / requests result in this type of special handling by the SCSP Proxy.

Query arguments are not processed, even when the resource is empty. A request with a query

argument is forwarded as-is to the cluster and receives no special processing by the Proxy.

The Proxy responds to a GET / request from a client running in a private network with the Proxy's

list of DX Storage IP addresses and data and metadata describing the Proxy's DX Storage cluster.

You can prevent the Proxy from returning cluster IP addresses using the configuration parameter

reportHosts. For more information about configuration parameters, see

Parameters

1.1.1.1. Scsp-Proxy-Cluster Request Header

The optional Scsp-Proxy-Cluster: cluster-name request header, if included with a request,

causes the Proxy to first compare the case-sensitive cluster-name against the Proxy's own

Chapter 3, Configuration

Version 1.2

December 2010