I have been trying to implement https auto-redirect for a particular links. I have three configuration file /etc/apache2/apache2.conf, /etc/apache2/sites-available/default, and /etc/apache2/sites-available/ssl. In /etc/apache2/sites-available/default file I added following script
<IfModule mod_proxy.c>
ProxyRequests Off
RewriteEngine on
# send all http to https
RewriteCond %{HTTPS} !=on
RewriteRule (.*)$ https://myhost.edu/~userna/link.php/$1 [R]
</IfModule>
But it is not working.

Can somebody tell me what am I missing?
Thanks in advance.

The Rewrite lines look OK.

Why is the Rewrite code inside the mod_proxy stuff? Are you sure mod_proxy is being loaded prior to this config line? Put it touside the <ifmodule mod_proxy.c> stuff and see what happens.

mod_proxy.c is located under directory /usr/lib/apache2/modules/. I assume that means it is enabled.

My second try.
I added following syntax on the bottom of file, /etc/apache2/apache2.conf

RewriteEngine On
RewriteCond %{SERVER_PORT} !443
RewriteRule (.*) https://mylink.edy/~username/login.php/$1 [L,R]

It is still not working.
Can somebody tell me what modules do I need and how I enable them?

No. You mus specifically tell Apache to use mod_proxy.

The Rewrite Module is enabled; otherwise, these directives would fail.

Are you sure SSL is enabled?? Try this:

RewriteRule ^fubar$  http://www.unix.com [R]

Yes. SSL is enabled. I can browse site using http and https since root directory set for both are same. Biggest confusion is which file do I use to configure auto-redirect. I using this link for reference.

AFP548 - Redirect http to https

Did you try my fubar rewrite rule?

Theoretically, any config file read in by httpd.conf can be used to configure the Rewrite rules.

Sorry otheus, It took so long to replay your message. Your fubar rewrite rule did not work on any of three config files. What am I missing? Can you tell me how to activate what module for rewrite?