，当我试图从一个JavaScript文件位于完全相同的域中的Web服务，使一个XMLHTT prequest，我得到它是如何可能的：

产地 http://mydomain.com 不受访问控制 - 允许 - 产地???

如果我改变mydomain.com为localhost，我不再有问题，但我想保持它为mydomain.com

我有什么修改，为什么摆在首位，因为它是同一个域？

1）在你的请求/响应头的样子。是服务器返回一个奇怪的的访问控制，允许原产地头？

2）这不只是域，它也是协议（HTTP VS HTTPS VS FTP等），端口（如果你有一个：8080或类似的东西），和潜在的后部分的.com /

How is it possible that when I try to make an XMLHTTPRequest from a javascript file to a web service located on the very same domain, I get:

Origin http://mydomain.com is not allowed by Access-Control-Allow-Origin ???

If I change mydomain.com to localhost, I no longer have problems, but I would like to keep it as mydomain.com

What do I have to edit, and why in the first place, since it's the same domain?

1) look in your request/response headers. Is the server returning a weird access-control-allow-origin header?

2) It's not just the domain, it's also the protocol (http vs https vs ftp etc), the port (if you have a :8080 or something like that), and potentially the part after the .com/