The requested URL was not found on this server.

[eluser]chubbypama[/eluser]
just moved my codeigniter app from one machine to another.
i'm getting the above error message.

here's what I've checked so far:
config.php for code igniter has the following:
$config['base_url'] = 'http://localhost/myapp/';

when i navigate to http://localhost/myapp/, i don't get any error messages, and nothing is displayed /rendered. I do a view source and there is no html on the page. (btw. I have specified "welcome" as my default controller in routes)

when i navigate to http://localhost/myapp/welcome, I get the error The requested URL was not found on this server.

I checked my apache2 access log this is what it contains:
127.0.0.1 - - [14/Aug/2012:11:48:32 -0400] "GET /myapp/welcome HTTP/1.1" 404 502 "-" "Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:14.0) Gecko/20100101 Firefox/14.0.1

shouldn't it have "GET http://localhost/myapp/welcome" instead of just "myapp/welcome"?

also i tried looking up the 502 error message and fuond that it means:
The server was acting as a gateway or proxy and received an invalid response from the upstream server
but i'm not sure i understand how to troubleshoot.

The thing is other applications work. So i can do "http://localhost/phpmyadmin" and it works.
Also i created a test.php page in my "myapp" folder and it works too.
I'm just new to web development so sorry if my question is basic.

I'm not using .htaccess as far as i can tell. I have the following variables set in my config.php for codeigniter:

$config['index_page'] = 'index.php';
$config['uri_protocol'] = 'AUTO';

Thanks.