Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 87)

ServerIron ADX Advanced Server Load Balancing Guide 75

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Content aware cache switching

Configuring policies for dynamic content

For dynamic Web pages, such as Active Server Pages, it may be preferable not to cache the

content. You can configure CSW policies on the ServerIron ADX that cause requests for these kinds

of pages to bypass the cache servers and go directly to the Internet.

In addition, the ServerIron ADX examines directives in the HTTP 1.0 or 1.1 header to determine

whether a request should be sent to the cache servers or to the Internet. When this feature is

enabled (the default), a request is sent to the origin server regardless of the URL string if one of the

following is true:

• The request contains a pragma:no-cache header (HTTP 1.0 requests)

• The Cache-Control header in the request contains a no-cache directive (HTTP 1.1 requests)

In the configuration in Figure 20 on page 76, the ServerIron ADX has CSW policies in place that

cause HTTP requests to be directed to the cache servers as follows:

• Requests that have URL strings with the text "asp" anywhere within go directly to the Internet

• Requests for all other content are directed to one of the cache servers in server group ID = 100

• HTTP 1.0 requests that have a pragma:no-cache header are sent to the Internet regardless of

the URL string

• HTTP 1.1 requests that have a Cache-Control header containing a no-cache directive are sent

to the Internet regardless of the URL string

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Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 87