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From Steve Loughran <>
Subject Re: Proxy issues
Date Tue, 21 Nov 2006 11:08:52 GMT
Mykel Alvis wrote:
> Hi,
> I'm testing out ivy 1.4.1 for purposes of possibly integrating it into a
> build stream and I can't seem to get the initial test to work for me.
> I AM behind a National Socialistic-esque proxy firewall that does virus
> checking on each and every file that comes across the internet connection,
> but that's the
> way it is here and nothing's likely to change in that respect.  Since I'm
> working on a Linux box on this primarily Windows network, I get little 
> to no
> support for any proxy issues I experience.

Well, you are now talking to the official maintainer of proxy settings 
for Ant. As I work behind a firewall, I get to experience the joy of 
proxies myself. Sometimes I have to work from home just to have a direct 
link with third party web service endpoints.

Trying to get proxies right in Java is hard. The problems are it is 
different for every private network, and every Java platform. You need 
different boxes in private networks to test reliably. There is better 
support/awareness in Java1.5, but it is java1.5 only, so ant cannot make 
easy use of it.

> I got a previous failure with "Server Redirected too many times".  
> Following
> some incidental advice in a forum posting, I added the 
> commons-httpclient to
> my CLASSPATH before invoking ant.  This seemed to just cause a hanging of
> the process.
> I did add a line into the "test" build.xml file as follows, with the 
> obvious
> appropriate changes:
> <setproxy proxyhost="PROXY.IP.HERE" proxypassword="mypass"
> proxyuser="myuser" proxyport="PROXY.PORT" />

that's an ant task to set the java http.proxyHost and http.ProxyPort 
properties. There are some other options you can se t

 > echo $ANT_OPTS
-Dhttp.proxyHost=web-proxy -Dhttp.proxyPort=8088

HttpClient doesnt use these system settings. My Alpine soap stack has to 
copy them by hand.

> This also did not help.
> I also set my http_proxy variable to the authenticated proxy location which
> did not help.
> The error seems typically to be " Connection 
> timed
> out:  connect"  which might be expected if one were having difficulty
> navigating an external connection.
> I did not expand my  commons-httpclient logging yet, as it is starting to
> seem as if this process might be more trouble than it's worth.

Unless Ivy is setting up the proxy, it is too much trouble.

1. Ant1.7.0RC1, which is available somewhere, does proxy diagnostics if 
you go
ant -diagnostics

2. That same version of Ant, running on Java1.5, tries to get the proxy 
settings from the OS, as documented in

You can get the same effect as #2 by going in Ant OPTS. In theory, this switch will 
pull out proxy settings from the OS. In windows, that means IE. In 
linux, well, nobody knows what it means. It doesnt find the default web 
browser and ask it. It doesnt ask KDE what it is. I think it may ask 
Gnome, or it may ask for the http_proxy settings.

My recommendations are

-try setting

ANT_OPTS=-Dhttp.proxyHost=myproxy -Dhttp.proxyPort=8080 +password ptions

Further reading

I'm thinking of writing some commons-proxysetup package in the future to 
do proxies right in Java
  -extract it from the OS reliably
  -have some java-app-wide override point where it can be set once for 
all apps
  -have a dynamic 'proxy changed' event to notify listening apps that 
everything has changed.
One option may just be to implement a private proxy that runs on 
localhost to do the dynamicness; everything is pointed at a local proxy 
that relays stuff direct or via a proxy server. We could make that smart 
and Java1.5+; if an nslookup("web.proxy") fails then we know there is no 
local proxy server, so try going direct, etc, etc. By putting the 
intelligence in a single app, we stop relying on every Java app 
developer in the world to get the logic right, logic that cannot be 
tested except by us behind-the-firewall people.


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