How to call an external URL from javascript

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Sreenivasa Komma
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Hi

When a user clicks a button, it is supposed to trigger a Java program by means of a http call with GET method.

URL looks like this: http://externalSever/javaPgm?queryString

Above call returns a string. I would like to process the return value in design studio javascript code.

Any help is appreciated.  Thanks - Sreeni