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Pools

BIG-IP® Reference Guide 4-43

The rule variables that can be used for header insertion are:

• client_addr

• client_port

• server_addr

• server_port

• link_qos

• ip_qos

Figure 4.11 shows a pool that inserts a header, using all of the above rule

variables.

Figure 4.11 Pool with header insertion string using multiple rule variables

The above header insertion string inserts a header such as that shown in

Figure 4.12 into an HTTP request:

Figure 4.12 Header resulting from a header insertion string within a pool

Note

If the rule variable specified is not a valid variable, the invalid variable

name is inserted directly into the HTTP request, with no substitution.

In addition to inserting a client IP address into an HTTP request, you can

configure an SSL Accelerator proxy to insert other types of headers into

HTTP requests. Examples of headers that an SSL proxy can insert are:

information on client certificates, cipher specifications, and client session

IDs.

For more information on rule variables and on configuring an SSL proxy to

insert headers into HTTP requests, see Rule-based pool selection, on page

4-50 and Inserting headers into HTTP requests, on page 4-95.

pool my_pool {

header insert "ClientSide:${client_addr}:${client_port} ->

${server_addr}:${server_port} tos=${ip_tos} qos=${link_qos}"

member 10.0.0.1:80

member 10.0.0.2:80

member 10.0.0.3:80

}

GET /index.html HTTP/1.0

ClientSide: 10.0.0.1:3340 -> 10.0.0.101:80 tos=16 qos=0

Host: www.yahoo.com

Connection: Keep-Alive

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