Add proxy auto-config support for libfetch.

Discussed with:	des

en/projects/ideas/ideas.xml

@@ -15,7 +15,7 @@ Ideas//EN"
 <ideas>
   <cvs:keywords xmlns:cvs="http://www.FreeBSD.org/XML/CVS" version="1.0">
     <cvs:keyword name="freebsd">
-      $FreeBSD: www/en/projects/ideas/ideas.xml,v 1.33 2008/01/02 15:22:26 netchild Exp $
+      $FreeBSD: www/en/projects/ideas/ideas.xml,v 1.34 2008/02/02 02:14:10 danger Exp $
     </cvs:keyword>
   </cvs:keywords>
 
@@ -1683,6 +1683,39 @@ clean.</p>
 	</desc>
       </idea>
 
+      <idea id="pacfile">
+	<title>Proxy auto-config file support for libfetch</title>
+
+	<desc>
+<p>A proxy auto-config (PAC) file contains a JavaScript function
+  "FindProxyForURL(url, host)" that determines which HTTP or SOCKS
+  proxy, if any, to use to access a given URL.  In most application the
+  file may be specified manually or discovered using the Web Proxy
+  Autodiscovery Protocol.  Support for PAC files in libfetch would make
+  fetch more versitle.</p>
+
+<p>Supporting PAC files nominally requires a fairly complete JavaScript
+  implementation.  There appear to be no BSD Licensed JavaScript
+  implementations so one will likely need to be written.  A minimalist
+  implementation of the language with commonly used constructs such as
+  if/else, string comparison, and functions would be sufficient in many
+  cases.</p>
+
+<p><strong>References</strong>:</p>
+<ul>
+  <li><a href="http://en.wikipedia.org/wiki/Proxy_auto-config">Wikipedia
+    Article on Proxy auto-config
+  <li><a href="http://wp.netscape.com/eng/mozilla/2.0/relnotes/demo/proxy-live.html">Proxy
+    Auto-Config File Format
+</ul>
+
+<p><strong>Requirements</strong>:</p>
+<ul>
+	<li>Strong knowledge of secure C programming.
+</ul>
+	</desc>
+      </idea>
+
       <idea id="pxeinstaller">
 	<title>PXE Installer</title>