[英]Reading file from MongoDB GridFS on Server Side in NodeJS Application
[英]Issue with downloading a file from GridFS in MongoDB/NodeJs/GridFS stack
我正在研究NodeJs API,我選擇使用GridFS來存儲和下載文件。 我有兩個API用於此事:上傳和下載。 當我使用Postman調用它們時,兩種API都能正常工作; 但是我在使用瀏覽器下載文件時遇到問題。 瀏覽器似乎看到了200個HTTP代碼,並期望文件在內容仍在流式傳輸時立即出現。 因此,它抱怨圖像或PDF等有錯誤或格式無效。 唯一可用的文件類型是MP3,瀏覽器啟動MP3播放插件播放音樂。
var Grid = require('gridfs-stream');
Grid.mongo = mongoose.mongo;
var gfs = new Grid(mongoose.connection.db);
//.... some code in here
exports.download = function(req, res) {
gfs.files.find({ "_id": mongoose.Types.ObjectId(req.params.id) }).toArray(function (err, files) {
if(files.length===0){
return res.status(400).send({
message: 'File not found'
});
}
var readstream = gfs.createReadStream({
filename: files[0].filename
});
readstream.pipe(res);
});
};
我使用Fiddler捕獲請求和響應:
這是請求:
GET http://localhost:9000/api/file/download/5586fd1a04de649c4eff2223?access_token=bluhbluhbluhbluhbluh HTTP/1.1
Host: localhost:9000
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.124 Safari/537.36
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8,fa;q=0.6
Cookie: _ga=xxxxxxxxxxxxx; wp-settings-1=editor%3Dhtml%26align%3Dleft%26unfold%3D1%26mfold%3Do%26hidetb%3D1; wp-settings-time-1=1434314682; session_id=xxxxxxxxxxxxxxxxx; connect.sid=xxxxxxxxxx; token=xxxxxxxxxx
這是回應:
HTTP/1.1 200 OK
X-Powered-By: Express
content-length: 2412930
Date: Mon, 22 Jun 2015 16:45:04 GMT
Connection: keep-alive
%PDF-1.4
%
< The rest of PDF content comes in here >
任何想法如何解決這個問題?
聽起來問題是MIME類型。 添加node-mime模塊並嘗試以下操作:
//Get Readstream code here
var mimetype = mime.lookup(files[0].filename);
res.setHeader('Content-disposition', 'attachment; filename=' + files[0].filename);
res.setHeader('Content-type', mimetype);
readstream.pipe(res);
您還可以將mimetype
設置為application/pdf
以便首先使用PDF文件對其進行測試。
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