make codeigniter guess $baseurl the correct way

Question

On my server i'm using nginx on port 8081 and apache on port 80 as an internal proxy to nginx.

And i have multiple domains .org,.com,.net

When i leave the $base_url empty in the config code igniter tries to guess the right base url , it shows that the base url is localhost:8081 instead of domain.org or domain.com

When i set it manually:

$base_url="domain.com";

It doesn't work when i open the other domains like domain.org for example because the $base_url is still on the .com domain .

Is there any way to make code igniter smarter guessing the right $base_url ?

Answer 1

Thanks Charlotte for the tip.

After some search on the HTTP_HOST server variable i discovered that apache is passing the HTTP_HOST to nginx as localhost:8081.

I use reverse proxy in apache to make the proxy behavior:

ProxyPass / http://localhost:8081/ ProxyPassReverse / http://localhost:8081/

I searched the Documentation of apache and found a directive called ProxyPreserveHost

When enabled, this option will pass the Host: line from the incoming request to the proxied host, instead of the hostname specified in the ProxyPass line.

i enabled it by adding this line:

ProxyPreserveHost On

And it worked , now codeigniter can read HTTP_HOST right and make the $base_url right.

Answer 2

sett base_url in config.php .
like this
$config['base_url'] = 'actual url'
or
$config['base_url'] = 'http://'. $_SERVER['HTTP_HOST'].'/';