To have the unsecured login page redirected to the secured https page, proceed as follow:
#1 On each OMS server, navigate into the htdocs directory, for example:
cd /u01/app/oracle/gc/gc_inst/user_projects/domains/GCDomain/config/fmwconfig/components/OHS/instances/ohs*/htdocs
#2 Create there the redirection page welcome-index.html (12c) or index.html (13c) with the following content:
<html>
<head>
<meta HTTP-EQUIV="REFRESH" content="1; url=https://xxxxx.xxx.com/em">
</head>
<body>
<center>
<img src="/images/company.png"/>
<p>
<p><font size="14"><font color="##FF0000"><font face="Calibri"><i>Redirecting</i></font></font></font></p>
</center>
</body>
</html>
Optionally include an image as above.