Pass username from apache Basic Authentication to cherrypy

I need to use apache basic authentication for part of my application. I would like to get the authenticated username from apache, but I cannot seem to find where to access it. I can see the username in the apache log, so I know it's there somewhere. After the user is authenticated by apache, the request is sent via proxy to a cherrypy server.

Here is the section of my apache vhost config:

<Location /ical>
  AuthType Basic
  AuthBasicProvider ldap
  AuthName "Example Calendar Login"
  AuthLDAPUrl "ldaps://ldap.example.net/ou=People,dc=example,dc=net?uid"
  Require valid-user

  ProxyPass http://localhost:8082/                                                                                                                                                                                                     
  ProxyPassReverse http://localhost:8082/                                                                                                                                                                                              
  SetEnv proxy-nokeepalive 1
</Location>

The user authentication and proxy bit is working just fine. Once the request is authenticated and sent to cherrypy, here are the headers I have in cherrypy:

(Pdb) pp cherrypy.request.headers
{'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
 'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.7',
 'Accept-Encoding': 'gzip,deflate',
 'Accept-Language': 'en-us,en;q=0.5',
 'Authorization': 'Basic xxxxxxxxxxx',
 'Connection': 'close',
 'Host': 'sub.example.net',
 'If-None-Match': 'e5b0879ce68fcce5b960ce4281c8d706',
 'Remote-Addr': '10.132.32.86',
 'User-Agent': 'Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.10) Gecko/20100915 Ubuntu/10.04 (lucid) Firefox/3.6.10',
 'X-Forwarded-For': 'xx.xx.xx.xx, xx.xx.xx.xx',
 'X-Forwarded-Host': 'sub.example.net, sub.example.net',
 'X-Forwarded-Server': 'sub.example.net, sub'}

Can anyone help me access the username from apache basic auth?