public void run() {
        try {
            response = execution.process(request);
        } catch (Exception e) {
            exception = e; // TODO: Log
        }
    }
Calls process on the execution of this.
This will result in either response or exception being set on this.
Calling this never throws an exception.
container-core/src/main/java/com/yahoo/processing/execution/RunnableExecution.java