— 指定URLにファイル（画像など）が存在するかチェック
–> {存在確認結果（boolean）, レスポンスヘッダー(NSDictionary), データ(NSData)}
on checkURLResourceExistence(aURL, timeOutSec as real)
　　set aRequest to (current application’s NSURLRequest’s requestWithURL:aURL cachePolicy:(current application’s NSURLRequestUseProtocolCachePolicy) timeoutInterval:timeOutSec)
　　set aRes to (current application’s NSURLConnection’s sendSynchronousRequest:aRequest returningResponse:(reference) |error|:(missing value))
　　set dRes to (first item of (aRes as list))
　　set bRes to (second item of (aRes as list))
　　if bRes is not equal to missing value then
　　　　set hRes to (bRes’s allHeaderFields())
　　　　set aResCode to (bRes’s statusCode()) as integer
　　else
　　　　set hRes to {}
　　　　set aResCode to -1 –error
　　end if
　　return {(aResCode = 200), hRes, dRes}
end checkURLResourceExistence

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