Fix CVE-2007-5000:

* src/modules/standard/mod_imap.c (menu_header): Fix cross-site
  scripting issue by escaping the URI, and ensure that a charset
  parameter is sent in the content-type to prevent autodetection by
  broken browsers.

Reported by: JPCERT


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@603597 13f79535-47bb-0310-9956-ffa450edef68