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JN_42992's avatar
JN_42992
Icon for Nimbostratus rankNimbostratus
May 27, 2010

http response not always fired

Hi, I have the iRule below deployed on a chassis running 9.3.1 (latest HF). This iRule does not always work. In fact, after some debugging, I noticed that HTTP_RESPONSE is not always fired. Any idea ...
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hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
May 27, 2010
Hi Jean,

 

 

Are you using RAM cache on the HTTP profile for the virtual server? The HTTP_RESPONSE event is triggered when the pool member sends a response, LTM has an HTTP profile on the virtual server and LTM parses the response's HTTP headers. If a response is sent via RAM cache, HTTP_RESPONSE won't be triggered. Instead, CACHE_RESPONSE will be triggered when a response is sent.

 

 

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

 

 

You can use the CACHE::header command to retrieve or modify the headers that will be sent in a cached response:

 

 

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

 

 

If you're not using RAM caching on the VS, then is it possible that the server isn't sending a response when you don't see HTTP_RESPONSE triggered? Or do you have any other iRules added to the virtual server?

 

 

Aaron