How to preserve data in a HTTP 302 redirect of a POST

Generally speaking, if you need to do a redirect and keep all post parameters, you will have to create a postback form which then has the client actually post to the new URL.

If the form that generates the POST is flowing through your LTM and you can't get the developers to update the target URL of the form, you may be able to use a stream replacement to change it on the way out of the LTM to the browser before they make the first post.