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* Sends the XMLHttpRequest object containing the completed response to a
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* specified callback function.
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* \param callback A callback function. Will be called when the response is
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* complete. Passed 1 parameter, an XMLHttpRequest object containing the
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* \param app IVLE app to call (such as "fileservice").
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* \param path URL path to make the request to, within the application.
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* \param args Argument object, as described in parse_url and friends.