Groovy的AsyncHTTPBuilder不会异步执行请求

@Test public void testPoolsizeAndQueueing() {
def http = new AsyncHTTPBuilder( poolSize : 5 ,
                                 uri : 'http://ajax.googleapis.com/ajax/services/search/web' )

def responses = []
/* With one thread in the pool, responses will be sequential but should
 * queue up w/o being rejected. */
10.times {
responses << http.get( query : [q:'Groovy', v:'1.0'] ) { return Thread.currentThread().name }
responses << http.get( query : [q:'Ruby', v:'1.0'] )  { return Thread.currentThread().name }
responses << http.get( query : [q:'Scala', v:'1.0'] )  { return Thread.currentThread().name }
}
def timeout = 60000
def time = 0
while ( true ) {
    if ( responses.every{ it.done ? it.get() : 0 } ) break
    print '.'
    Thread.sleep 2000
    time += 2000
if ( time > timeout ) assert false
}
responses.each { println it.get() }
http.shutdown()
}