User Agent?

No need for a sniffer trace. The URI is available with the http_uri varaible and the user agent is just a HTTP header that you can query with the http_header command.

A simple test for the URI could be something like this:

if (http_uri starts_with "/dir1/dir2" ) {
  use pool pool1
} else if (http_uri contains "somthing") {
  use pool pool2
} else if (http_uri ends_with ".gif") {
  use pool pool3
}

As for User-Agents, the tricky part here is not finding the value, but distinguishing the browser since each version of each browser has a different User-Agent string.

I found this site from Google that lists out every browser I ever heard of (and many more)

http://www.zytrax.com/tech/web/browser_ids.htm

Click here

Here are the values I see from browsers on my machine:

IE6: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50215)

FireFox 1.0.7: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7

And to check the User-Agent header you could do something like the following:

if (http_header("User-Agent") contains "Opera") {
  use pool opera_pool
} else if (http_header("User-Agent") contains "Firefox") {
  use pool firefox_pool
} else if (http_header("User-Agent") contains "Safari") {
  use pool safari_pool
} else if (http_header("User-Agent") contains "MSIE") {
  use pool internet_explorer_pool
} else if (http_header("User-Agent") contains "Netscape") {
  use pool netscape_pool
} else if (http_header("User-Agent") contains "Mozilla/5.0") {
  use pool mozilla_pool
} else {
  use pool other_browser_pool
}

Of course, you can mix-and-match these all together to suit your needs.

Oh, and if you want to debug your script, make sure you throw in a few log statements

log local0.debug "Uri: " + http_uri
log local0.debug "UserAgent: " + http_header("User-Agent")

For more information on the builtin variables and functions, I would suggest you check out the BIG-IP product manual (available online at tech.f5.com).

-Joe

Joe, you ROCK!!!

 

 

Is "User-Agent" a feild in the http header? Meaning I can use the following check but change "Opera" to what over browser or text I am looking for?

 

 

if (http_header("User-Agent") contains "Opera")

 

 

Thanks a TON

 

 

Mike

I have been looking in the manual, but where can I get a list of the "header-tag-string" options.

 

 

Thanks again,

 

 

Mike

Posted By mpones on 9/22/2005 12:08 PM

 

 

I have been looking in the manual, but where can I get a list of the "header-tag-string" options.

 

 

If you look in the "iRules" section of the BIG-IP Reference Guide, look for the table titled "Expressions" where you will find all the http_* commands and variables as well as the relational operators (starts_with, contains, etc).

 

 

Is this what you were asking or were you looking for something different?

 

 

-Joe

Actually Opera allows the user to choose what browser type it reports. It offers Opera, Mozilla 5.0 and MSIE 6.0 :-) In all cases, the User-Agent string contains Opera (either at the begining or at the end). So, you should check for Opera before Mozilla and MSIE because the User-Agent string may contain both of them (along with Opera) ... or use a regular expression to narrow down the match (but it is slower than simple string matches).