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Joel_Newton's avatar
Joel_Newton
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Oct 19, 2016

iRule gets cached and executes when it shouldn't

I have a maintenance iRule I apply to certain virtual servers during downtime operations. It uses the 'when HTTP_REQUEST' event and writes out the HTML for the page being displayed to the end user. ...
application delivery
iRules
LTM
Hannes_Rapp's avatar
Hannes_Rapp
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Hello Joel,

Can you share one line from your iRule, the HTTP::respond function which responds with HTML content? You may replace the HTML code with a placeholder but I'd like to see if you include any headers.

Joel_Newton's avatar
Joel_Newton
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Oct 19, 2016

Thanks, Hannes. This definitely feels like progress. I was able to get the desired behavior with the following headers:

 

"Cache-Control" "no-cache" "Pragma" "no-cache" "Connection" "Close" "Edge-Control" "no-store,downstream-ttl=-1"

 

One thing I noticed, though, was that if I used the 'event disable' command after setting the headers, and then make a 'event HTTP_REQUEST enable' call as part of the HTTP_RESPONSE, I might still see the problem. The desired behavior is that only this maintenance iRule fire and all others be disabled, but I'm thinking that doing an 'event disable' isn't the correct way. Any thoughts, or is this question scope creep? 🙂 Or does the Connection Close header preclude any other iRules from executing in the same session?