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iyanus_39384's avatar
iyanus_39384
Icon for Nimbostratus rankNimbostratus
Dec 01, 2010

Outbound iRule STREAM Rewrites for CDN

Hi Folks,     We have a legacy app that has a lot of static content that we want to move to a CDN. I have succesfully created a stream profile to do some of the outbound translation, however th...
application delivery
dev
devops
iRules
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Dec 01, 2010
Hi Iain,

 

 

You should be able to do this with a STREAM::expression based iRule. In HTTP_RESPONSE, set the STREAM::expression to:

 

 

http://devcentral\.f5\.com/path/to/static/asset\.(?:jpg|gif|png|swf)

 

 

Then in the STREAM_MATCHED event, you can retrieve the full match using STREAM::match and rewrite the string using string map:

 

 


when STREAM_MATCHED {

   log local0. "[IP::client_addr]:[TCP::local_port]: matched: [STREAM::match], replaced with: [string map {http://devcentral.f5.com/ http://my.cdn/} [STREAM::match]]"  
   STREAM::replace "[string map {http://devcentral.f5.com/ http://my.cdn/} [STREAM::match]]"  
}

 

 

For details on the HTTP_RESPONSE code, check the STREAM::expression wiki page:

 

 

http://devcentral.f5.com/wiki/default.aspx/iRules/stream__expression

 

 

Aaron