Question

I use socket. IO to do a chat application, the client is 0.8.4 and running normally. But when I put the socket. 0.9.4 IO upgrade to find the cross domain problem, other documents did not change, the following is wrong content:

XMLHttpRequest cannot load http://localhost:8000/socket.io/1/? T = 1333528698474. http://mydomain.com Origin is not allowed by Access-Control-Allow-Origin.

Some people have the same problem? Or who know solution? Thank humbly!

Answer 1

Set the Access-Control-Allow-Origin header to your URL in the response.

NodeJS sample using setHeader:

res.setHeader('Access-Control-Allow-Origin','http://mydomain.com');
// or
res.setHeader('Access-Control-Allow-Origin','*');