Cisco Explorer 4700 Installation Guide download pdf (Page 313)

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Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance

OL-26645-01

Chapter 8 Configuring Parameter Maps

Configuring Optimization Parameter Maps

Override Server

Response Headers

Indicate how the ACE is to handle origin server response headers (primarily for embedded

objects):

• N/A—This feature is not enabled.

• All Cache Request Headers Are Ignored—The ACE is to ignore all response headers.

• Overrides The Cache Control: Private HTTP Header From A Response—The ACE is to ignore

cache control response headers that state private.

UTF-8 Character Set

Threshold

The UTF-8 (8-bit Unicode Transformation Format) character set is an international standard that

allows Web pages to display non-ASCII or non-English multibyte characters. It can represent any

universal character in the Unicode standard and is backwards compatible with ASCII.

Enter the number of UTF-8 characters that need to appear on a page to constitute a UTF-8

character set page. Valid entries are integers from 1 to 1,000,000.

Server Load Threshold

Trigger (%)

The server load threshold trigger indicates that the time-to-live (TTL) period for cached objects is

to be based dynamically on server load. With this method, TTL periods increase if the current

response time from the origin sever is greater than the average response time and decrease if the

current response time from the origin server is less than the average response time when the

difference in response times exceeds a specified threshold amount.

Enter the threshold, expressed as a percent, at which the TTL for cached objects is to be changed.

Valid entries are from 0 to 100 percent.

Server Load

Time-To-Live Change

(%)

This option specifies the percentage by which the cache TTL is increased or decreased in response

to a change in server load. For example, if this value is set to 20 and the current TTL for a response

is 300 seconds. and if the current server response times exceeds the trigger threshold, the cache

TTL for the response is raised to 360 seconds.

Enter the percent by which the cache TTL is to be increased or decreased when the server load

threshold trigger is met.

Valid entries are from 0 to 100 percent.

Delta Optimization

Mode

Select the method by which delta optimization is to be implemented:

• N/A—This option is not configured.

• Enable The All-User Mode For Delta Optimization—The ACE is to generate the delta against

a single base file that is shared by all users of the URL. This option is usable in most cases if

the structure of a page is common across all users, and the disk space overhead is minimal.

• Enable The Per-User Mode For Delta Optimization—The ACE is to generate the delta against

a base file that is created specifically for that user. This option is useful when page contents,

including layout elements, are different for each user, and delivers the highest level of

condensation. However, this increases disk space requirements because a copy of the base

page that is delivered to each user is cached. This option is useful when privacy is required

because base pages are not shared among users.

String To Be Used For

Server HTTP Header

Use this option to define a string that is to be sent in the server header for an HTTP response. This

option provides you with a method for uniquely tagging the context or URL match statement by

setting the server header value to a particular string. The server header string can be used when a

particular URL is not being transmitted to the correct target context or match statement.

Enter the string that is to appear in the server header. Valid entries are quoted text strings with a

maximum of 64 alphanumeric characters.

Table 8-5 Optimization Parameter Map Attributes (continued)

Field Description

1 ... 312 313 314 ... 648

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