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Jon_Strabala_46's avatar
Jon_Strabala_46
Icon for Nimbostratus rankNimbostratus
Feb 03, 2010

How to use HTTP::respond to send a 1x1 gif

Hello, I am trying to write a simple iRule to that uses HTTP::respond (from HTTP_REQUEST) to send a 1x1 gif back to the client on any request. I build a 1x1 gif (44 bytes) bu...
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Jon_Strabala_46's avatar
Jon_Strabala_46
Icon for Nimbostratus rankNimbostratus
Feb 03, 2010
Thanks Aron, this worked great 

   
   when RULE_INIT {   
    prepare a (44 byte transparent) gif for short-circuit injections   
   set ::base641x1tgif   "R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOwA="   
   set ::i1x1tgif  [b64decode [lindex $::base641x1tgif 0]]   
   }   
   when HTTP_REQUEST {   
   HTTP::respond 200 content $::i1x1tgif noserver "Content-Type" "image/gif"   
    HTTP::respond 200 content $::i1x1tgif  "Content-Type" "image/gif"   
   }

Note, you do not need to account for the extra length for other characters such as the content type. You can and 1-N response headers at in the response this is not considered content.

Jon