What Is The Cross Domain Issue

If I asked a stupid question here, Please don't laugh at me . I have being heard Cross Domain Issue many times, But not really get involved in it in real case. So I searched it in

Solution 1:

This is a security restriction that prevents requests being made from one origin to another.

For example, it will prevent an https:// page hitting an http:// address because the protocol is different.

It will stop example.com calling another.com because it is a different domain.

It will stop www.example.com calling subdomain.example.com because it is a different sub domain.

And it will stop example.com:80 calling example.com:8080 because it is a different port.

It is possible to make cross-origin requests either using JSONP (if you trust the server!) or using a CORS request (Cross-Origin Resource Sharing), which both client and server must agree to (I can supply more details if you need it on this).

Solution 2:

1.what exactly cross domain issue is & not allowed : it is because same-site origin policy which blocks Web pages from accessing data from another domain. for information assurance, javascript is limited to send request from one to another.

2.A cross domain request is not a wrong one. you may deal with it by some methods,like jsonp.

this link is about jsonp: Jsonp

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