301 redirect to new url with splash page and retain uri

You can use Javascript or a meta-refresh to display a message like that. The trick is figuring out what HTML to send back to the client. Once you figure that out, you can use HTTP::respond $status_code content "..." to do it.

Here's one example from a random site: http://www.pageresource.com/html/metref.htm

Note that if you want to include an iRule command or variable to set the host or URI dynamically, you'll need to wrap the HTML in double quotes and escape any quotes in the HTML with backslashes. Here's an untested example:

HTTP::respond 200 content "


Page has moved


This page has moved. If your browser does not automatically redirect you in a few seconds, click  to go to the new page.

"

Aaron