maintenance page redirection works for http but not https

Your irule will redirect ALL requests to /maintenance.html, including requests for /maintenance.html if this is irule is redirecting back to the same virtual server. You have to bypass the redirect for requests that are coming in for /maintenance.html(or any other objects that you don't want redirected. The rule below will redirect all requests, except requests for /maintenance.html, to https://abc.com/maintenance.html This may not accomplish everything you desire, as there may be other objects on the page that you also have to bypass the redirect for.

when HTTP_REQUEST {
  switch -glob [string tolower [HTTP::path]] {
    "/maintenance.html" {
    }
    default {
    HTTP::redirect "https://abc.com/maintenance.html"
    }
}

The following would redirect for everything except /maintenance.html, /image1.png, and image2.png

when HTTP_REQUEST {
  switch -glob [string tolower [HTTP::path]] {
    "/maintenance.html" -
    "/image1.png" -
    "/image2.png" {
    }
    default {
    HTTP::redirect "https://abc.com/maintenance.html"
    }
}

Eric