我已經(jīng)在用于node.js的快速框架上編寫了REST API，該API可以處理來自Chrome中的js控制臺和URL欄等的請求?，F(xiàn)在，我試圖使其適用于來自另一個應(yīng)用程序的請求域（CORS）。由javascript前端自動發(fā)出的第一個請求是對/ api / search？uri =的請求，并且似乎在“預檢” OPTIONS請求中失敗。在我的快速應(yīng)用中，我使用以下方法添加了CORS標頭：var allowCrossDomain = function(req, res, next) {    res.header('Access-Control-Allow-Origin', '*');    res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');    res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With');    // intercept OPTIONS method    if ('OPTIONS' == req.method) {      res.send(200);    }    else {      next();    }};和：app.configure(function () {  app.use(express.bodyParser());  app.use(express.methodOverride());  app.use(app.router);  app.use(allowCrossDomain);  app.use(express.static(path.join(application_root, "public")));  app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));});從Chrome控制臺中，我得到了以下標題：請求網(wǎng)址：http：//furious-night-5419.herokuapp.com/api/search？uri = http％3A％2F％2Flocalhost％3A5000％2Fcollections％2F1％2Fdocuments％2F1請求方法：OPTIONS狀態(tài)碼：200 OK請求標題Accept:*/*Accept-Charset:ISO-8859-1,utf-8;q=0.7,*;q=0.3Accept-Encoding:gzip,deflate,sdchAccept-Language:en-US,en;q=0.8Access-Control-Request-Headers:origin, x-annotator-auth-token, acceptAccess-Control-Request-Method:GETConnection:keep-aliveHost:furious-night-5419.herokuapp.comOrigin:http://localhost:5000Referer:http://localhost:5000/collections/1/documents/1User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5查詢字符串參數(shù)uri:http://localhost:5000/collections/1/documents/1響應(yīng)標題Allow:GETConnection:keep-aliveContent-Length:3Content-Type:text/html; charset=utf-8X-Powered-By:Express這看起來像API應(yīng)用程序發(fā)送的標題不正確嗎？謝謝。