node.js - ExpressJS uncaughtException: [TypeError: opt.expires.toUTCString is not a function] -

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i'm getting following weird behaviour happens randomly , can't reproduce can "fix".

i have static webapp send file express api. i'm not sure it's best practice on router:

router.get('/', function(req, res, next) { var webappdir = path.join(__dirname, '..', '..','webappsimple');  //show user profile if(req.isauthenticated() || consts.webapp.debug == 1) {     res.sendfile(webappdir + '/index.html');     //res.json({});  } //show signup else {     res.redirect('/signup'); }   });

then following error:

'typeerror: opt.expires.toutcstring not function',  '    @ object.serialize (/users/andreymigalovich/projects_localmac/print-that-sheet/server/node_modules/express/node_modules/cookie/index.js:135:56)',  '    @ serverresponse.res.cookie (/users/andreymigalovich/projects_localmac/print-that-sheet/server/node_modules/express/lib/response.js:804:36)',  '    @ serverresponse.res.writehead (/users/andreymigalovich/projects_localmac/print-that-sheet/server/node_modules/express-session/index.js:168:11)',  '    @ serverresponse._implicitheader (_http_server.js:157:8)',  '    @ serverresponse.outgoingmessage.write (_http_outgoing.js:433:10)',  '    @ readstream.ondata (_stream_readable.js:529:20)',  '    @ emitone (events.js:90:13)',  '    @ readstream.emit (events.js:182:7)',  '    @ readableaddchunk (_stream_readable.js:147:16)',  '    @ readstream.readable.push (_stream_readable.js:111:10)',  '    @ onread (fs.js:1818:12)',  '    @ fsreqwrap.wrapper [as oncomplete] (fs.js:614:17)'

if change res.sendfile(webappdir + '/index.html'); res.json({}); don't error , browser shows empty page (as should..)

the problem "fixed" when delete entire content on index.html page, refresh browser paste content again (without changing anything) , refresh browser again. doing fixes problem unknown amount of time.

i'm using nodejs v5.6.0 with: "express": "~4.13.1" , "express-session": "~1.0.0"

hoping better understanding of what's going on or change way send static files avoid whole issue.


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