Forum Discussion

dubdub's avatar
dubdub
Icon for Nimbostratus rankNimbostratus
Oct 26, 2011

HTTP::payload replace length

Hi all, I used Colin's excellent example of replacing outbound payload content at http://devcentral.f5.com/Tutorials/...Rules.aspx - but was curious, that last line where it says: HTTP::payloa...
application delivery
dev
devops
iRules
Thomas_Schaefer's avatar
Thomas_Schaefer
Icon for Nimbostratus rankNimbostratus
Oct 27, 2011
One more thought...This is actually clearer in the example of scrubbing a credit card number somewhere in the middle of the string where the first number is not 0. If you find a credit card at position 1300, then it seems pretty clear that you replace starting at position 1300 for 16 (length of the credit card--except AMEX). Perhaps the confusion comes in the fact that in this case the length you want to replace is 16 which also happens to be the length of the new string as well. If I have the statement 
HTTP::payload replace 1300 16 $scrubbedCard
it is not obvious which is which, but in fact, it is the size of the content you are replacing.