IE + Java Applets classload bypass a proxy

E

ed.stark

After much investigation, the solution to this issue has been found.

We were trying to launch some web content that used Java Applets to
display navigation items. The content was being hosted on an internal
server, and a rule in IE had been setup to bypass the proxy for the
URL where the courses existed i.e. (exclusion URL) http://localserver.net/

When launching the content in IE, we came up against classloading
errors in the Java console in this environment, the courses could be
launched perfectly over the web. We worked out that the proxy was
still being callled, as in the Java console we could still see the
"using proxy" output. In the control panel, Java properties, we
changed the setting to stop the JVM from using the browser settings
and make direct connections, which resolved the issue. However, this
was not a solution, as we didn't want Java to be making direct
connections, we needed the JVM to use the proxy / browser settings
where we wanted it to.

It was clear that the JVM was ignoring the proxy exclusion list, as
any URL listed in their could not be loaded with Java content. Heres
the trick, when attempting to bypass proxy server for URLs that
contain Java content, simply add the exclusion as *.localserver.net
and leave the protocol out. This worked a treat but was not easy to
work out and not documented anywhere.

I hope this post is useful to someone......

Ed Stark
 

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