Alteon Application Switch Operating System Application Guide
Layer 7 String Handling
806 Document ID: RDWR-ALOS-V2900_AG1302
• HTTP Host and URL SLB—The HTTP Host header takes precedence because it is specified first.
Because and is the operator, both a Host Header and URL string are required. If either is not
available, the request is dropped.
— If a request from a client contains a URL string (such as "/gold") but not a Host Header, it is
not served by any real server.
— If a request from a client contains a URL string (such as "/gold") and Host Header, it is
served only by real server 3.
Assigning Multiple Strings
Figure 136 - Content Precedence Lookup Multiple Strings Example, page 806 illustrates an example
of a company providing content for two large customers: Customers A and B. Customer A uses
www.a.com as their domain name and Customer B uses www.b.com.
The company has a limited number of public IP addresses and wants to assign them on a very
conservative basis. As a result, the company implements virtual hosting by advertising a single
virtual server IP address that includes both customers' Web sites. Additionally, the hosting company
assigns only one service (HTTP port 80) to support the virtual server.
The virtual hosting company wants to maintain the flexibility to allow different types of content to be
placed on different servers. To make most efficient use of their server resources, they separate their
servers into two groups, using their fastest servers to process dynamic content (such as.cgi files)
and their slower servers to process all static content (such as .jpg files).
Figure 136: Content Precedence Lookup Multiple Strings Example
To configure Content Precedence Lookup for this example, the hosting company groups all the real
servers into one real server group even though different servers provide services for different
customers and different types of content. In this case, the servers are set up for the purpose as
illustrated in Table 69.
Table 69: Real Server Content
Server Customer Content
Server 1 Customer A Static .jpg files
Server 2 Customer A Static .jpg files
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