- Craig A West brought CURLOPT_NOPROXY and the corresponding --noproxy option.

They basically offer the same thing the NO_PROXY environment variable only
  offered previously: list a set of host names that shall not use the proxy
  even if one is specified.

docs/curl.1

@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -815,6 +815,13 @@ you to succeed. (Added in 7.16.0)
 
 Note that this is the negated option name documented. You can thus use
 \fI--sessionid\fP to enforce session-ID caching.
+.IP "--noproxy <no-proxy-list>"
+Comma-separated list of hosts which do not use a proxy, if one is specified.
+The only wildcard is a single * character, which matches all hosts, and
+effectively disables the proxy. Each name in this list is matched as either
+a domain which contains the hostname, or the hostname itself. For example,
+local.com would match local.com, local.com:80, and www.local.com, but not
+www.notlocal.com.
 .IP "--ntlm"
 (HTTP) Enables NTLM authentication. The NTLM authentication method was
 designed by Microsoft and is used by IIS web servers. It is a proprietary