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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
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iRules
hooleylist's avatar
hooleylist
Icon for Cirrostratus rankCirrostratus
Dec 02, 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