Andrew Phillips created JCLOUDS-1075:
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             Summary: Make proxy configuration logic and settings clearer and 
more in line with Java conventions
                 Key: JCLOUDS-1075
                 URL: https://issues.apache.org/jira/browse/JCLOUDS-1075
             Project: jclouds
          Issue Type: Improvement
          Components: jclouds-core
    Affects Versions: 1.9.2
            Reporter: Andrew Phillips
            Assignee: Andrew Phillips
             Fix For: 2.0.0


>From the description of https://github.com/jclouds/jclouds/pull/914:

In the absence of any special jclouds.*proxy* settings, jclouds should respect 
the normal JVM conventions for proxy detection, such as the 
java.net.httpProxyHost property. For it to default to no proxy, unlike 
everything else in java, is surprising. Previously jclouds only looked for the 
JVM proxy if jclouds.use-system-proxies was set, and then in a cumbersome way:

* jclouds.use-system-proxies tried to set java.net.useSystemProxy but that is 
read once at startup and subsequently ignored by the JVM so it had little effect
* so the effect of jclouds.use-system-proxies was effectively to tell jclouds 
to use the default proxy chosen by the JVM looking at the java.net.* 
properties, not necessarily the OS proxy referred to by java.net.useSystemProxy
* the default value of jclouds.use-system-proxies was taken from 
java.net.useSystemProxy and so while that succeeds in causing 
java.net.useSystemProxy to take effect, it was succeeding in a strange 
accidental way: the only way for the normal java.net.httpProxyHost and others 
to take effect was to set jclouds.use-system-proxies=true but make sure 
java.net.useSystemProxy=false

This adds explicit control over whether the JVM default proxy is usable (true 
by default), and switches the precedence so that if a user specifies a 
jclouds.proxy-host then it is used -- irrespective of whether any other system 
proxies or jvm proxies are specified.

I think this is more what a user would expect if they do need to set special 
proxy settings for jclouds to use. More importantly in most cases they can now 
just set JVM proxy settings and the right thing will happen.



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