As it seems there is no out-of-the-box way in Sencha ExtJS to provide a configuration based on the build environment (development, testing or production) to your application. Since you need at least different urls for your proxys, it makes sense to have a mechanism in place that would generate the respective configuration for you. This is our solution for the problem.
Environment dependent configuration in Sencha ExtJS
This blog post was published more than one year ago and might be outdated!
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