Setting for proxy

[salmiak]

I'm getting timed out errors when I try to install modules or check for updates. 

I'm fairly certain the problem is that the host that i'm on uses a proxy for external http requests.

Is there a setting somewhere like the following in wordpress? (I'm already prettty sure there isn't)

define('WP_PROXY_HOST', 'proxy.domain.com');
define('WP_PROXY_PORT', '8080');

I tried adding :

'proxy' => 'tcp://proxy.domain.com:8080',
'request_fulluri' => true

to the $options in the send() function in WireHttp. This makes the update check work but the download still fails.

Any help?