iRules Recipe 4: Static Maintenance Page
Updated Jun 06, 2023
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There are limitations with LB_FAILED, for the ifile must be short enough to fit in one data packet (sol9456: Using the HTTP::respond iRule command in the LB_FAILED event may result in truncated responses).
Also it might be appropriate to use the "503" HTTP status code in the response; search engines will not index the maintenance message with that.