Specifications

2-7
Cisco Internet Streamer CDS 2.0-2.3 Software Configuration Guide
OL-13493-04
Chapter 2 Network Design
Service Workflow
HTTP Servers
The no-cache directive in an HTTP server response header tells the client that the content requested is
not cacheable. When an HTTP server responds with a no-cache directive, the Content Acquirer behaves
as follows:
• If the content to be ingested is specified in an <item> tag in the Manifest file, the Content Acquirer
ignores the no-cache directive and fetches the content anyway.
• If the content to be acquired is specified in a <crawler> tag in the Manifest file, the Content Acquirer
honors the directive and does not fetch the content.
Internet Streamer
The Internet Streamer application on the Service Engine participates in the delivery service by
distributing content within the CDS and delivering content to the clients. The Service Engines can be
shared among other delivery services.
HTTP Download—Disabling
Note The ability to disable HTTP downloads on a per-delivery service basis is a feature of Release 2.1.
In some instances, for example when there are contractual obligations to prevent clients from
downloading content, it may be necessary to disable HTTP downloads on a delivery service. When
HTTP download is disabled, the Web Engine returns a 403 forbidden message.
Service Workflow
What follows is a description of the workflow of a delivery service. Table 2-1 shows sample values for
for the delivery service workflow described in Figure 2-3. The delivery service workflow is described in
detail following Figure 2-3.
Table 2-1 Delivery Service Parameters Example
Parameter Value
Type Caching/Prefetch
Origin Server www.ivs-internal.com
Service Routing Domain Name cr-ivs.videonet.com
Delivery Service Contents http://www.ivs-internal.com/video/wmv-152
http://www.ivs-internal.com/video/wmv-92
http://www.ivs-internal.com/video/wmv-212
http://ww.ivs-internal.com/video/wmv-59 type=“cache”
http://www.ivs.internal.com/video/wmv-6 type=”cache”