URL Redirection from Https to Http

I'm assuming the "if request comes from" actually means the client is requesting the Host specified? Depending on how your DNS resolves and how you've configured your Virtual Server TCP listeners, the iRule below should do the job.

when HTTP_REQUEST {

  if { [HTTP::host] == "abc.com" }{
    HTTP::respond 302 location "https://abc.com"
    event disable
    TCP::close
  } elseif { [HTTP::host] == "osabc.com" }{
    HTTP::respond 302 location "http://abc.com"
    event disable
    TCP::close
  } else {
    Do nothing; the request will be routed to a back-end server as defined in default pool applied to a VS.
  }
}

Can you please explain me about last statement " do nothing..."

Hello Hannes, we have configured system default http to https irule on VIP-80 and then redirection from http to https is working perfectly. But we want to redirect some uri like abc.com/product, abc.com/ers that should not redirected towards https that should open via only http://abc.com/product instead of https://abc.com/product can you please help me for the same..

when HTTP_REQUEST {

  switch -glob [HTTP::host][string tolower[HTTP::path]] {
    "abc.com/product*" -
    "abc.com/product2*" -
    "abc.com/ers*" {
      HTTP paths of abc.com as defined above are not redirected to HTTPS
      return
     }
    "abc.com*" {
      All other HTTP paths of abc.com are redirected to HTTPS
      HTTP::respond 302 location "https://abc.com"
      event disable
      TCP::close
    }
    "osabc.com*" {
      All HTTP paths of osabc.com are redirected to abc.com
      HTTP::respond 302 location "http://abc.com"
      event disable
      TCP::close
    }
  }
}

Notes: you may remove the asterisks at the end of your exclusional HTTP paths (product, productX, ers) for an exact match.