Detect browser JRE version?

Actually, it looks like the client JRE downloads JAR files and includes the JRE version number in the User-Agent string:

GET /hyperstat/normal_p_shade.jar HTTP/1.1

content-type: application/x-java-archive

accept-encoding: pack200-gzip,gzip

Host: davidmlane.com

Cache-Control: no-cache

Pragma: no-cache

User-Agent: Mozilla/4.0 (Windows XP 5.1) Java/1.6.0_03

Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2

Proxy-Connection: keep-alive

If-Modified-Since: Thu, 07 Sep 2006 17:23:00 GMT

Here is an example which checks each HTTP request. If the request contains "java/", it parses the first three digits in the version string and sets a pool based on the first two:

when HTTP_REQUEST {
    Log debug messages to /var/log/ltm?  1=yes, 0=no
   set java_version_debug 1
    Check if the User-Agent header contains the string "java/"
   if {[string tolower [HTTP::header value User-Agent]] contains "java"}{
       Parse out the Java version from "some text java/1.6.0 some text" to "1.6.0"
      switch -glob [string range [getfield [string tolower [HTTP::header value User-Agent]] "java/" 2] 0 4] {
         1.6.* {
             Log a debug message to /var/log/ltm
            if {$java_version_debug}{log local0. "Matched 1.6.*"}
             Set the pool to the v1.6 pool
            pool java_1.6.x_pool
         }
         1.5.* {
            if {$java_version_debug}{log local0. "Matched 1.5.*"} 
            pool java_1.5.x_pool
         }
         1.4.* {
            if {$java_version_debug}{log local0. "Matched 1.4.*"} 
            pool java_1.4.x_pool
         }
         default {
            if {$java_version_debug}{log local0. "Matched default"} 
            pool java_default_pool
         }
      }
   }
}

This assumes that you don't need to send client requests to the same pool they may have requested without the Java string in the User-Agent header.

Here is a version with intermediate variables that might help if you want to follow the commands:

when RULE_INIT {
   set user_agent "Mozilla/4.0 (Windows XP 5.1) Java/1.6.0_03 test"
   set user_agent [string tolower $user_agent]
   log local0. "\$user_agent: $user_agent"
   
   set java_version_string [getfield $user_agent "java/" 2]
   log local0. "\$java_version_string: $java_version_string"
   set java_version [string range $java_version_string 0 4]
   log local0. "\$java_version: $java_version"
   log local0. "Test: [string range [getfield [string tolower $user_agent] "java/" 2] 0 4]"
}

Sample log output:

Rule : mozilla/4.0 (windows xp 5.1) java/1.6.0_03 test

Rule : $java_version_string: 1.6.0_03 test

Rule : $java_version: 1.6.0

Rule : Test: 1.6.0

Holler if you have questions...

Aaron