Nodejs setting cookies across domains

Do the project in the Vue family bucket +express. Want to do a free landing function, select the session program. After the server Setup session, the response headers returned are Set-cookie, but the browser's application cookies are missing SessionID cookies that are not returned. It took a long time to realize that this was a cross-domain cause problem. The front end is 8080 ports and the back end is 4000 ports. By default, cross-domain request browsers do not carry credential information (cookies, SSL certificates, etc.), and server-set cookies are blocked by the browser

So the solution is

The frontend of the Ajax latter Axios needs to be set Withcredentials to true. Mine is Axios, so the request will carry a cookie.

At the same time, the backend uses cors middleware. Can

// need to install and introduce middleware corsconst Cors = require (' cors '); var corsoptions = {  ' http://localhost:8080 ',  true,  ' 1728000 '  // This is for }app.use (Cors (corsoptions))   specifically set across domains Set up cross-domain

If you do not use middleware, you can do so, the settings displayed

Access-control-allow-credentials is True

Note Origin cannot be an * number. This way, the browser will not intercept the cookie set by the server.

1App.all (' * ',function(req, res, next) {2Res.header ("Access-control-allow-origin", Req.headers.origin);//need to display the settings source3Res.header ("Access-control-allow-headers", "Origin, X-requested-with, Content-type, Accept");4Res.header ("Access-control-allow-methods", "Put,post,get,delete,options");5Res.header ("Access-control-allow-credentials",true);//with Cookies7Res.header ("Content-type", "Application/json;charset=utf-8");8 next ();9});

Nodejs setting cookies across domains