How do I send an AJAX request on a different port with jQuery?

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This breaks the Same origin policy. You cannot use a different port, even when using the same domain.

You can use JSONP as Doug suggested.

Or else, as another possible workaround, you could set up a very simple reverse proxy (using mod_proxy if you are on Apache). This would allow you to use relative paths in your AJAX request, while the HTTP server would be acting as a proxy to any “remote” location.

The fundamental configuration directive to set up a reverse proxy in mod_proxy is the ProxyPass. You would typically use it as follows:

ProxyPass     /ajax/     http://www.localhost:8080/

In this case, you would request /ajax/test.xml with jQuery, but in fact the server would serve this by acting as a proxy to http://www.localhost:8080/test.xml internally.

If you are using IIS, you may want to use the Managed Fusion URL Rewriter and Reverse Proxy to set up a reverse proxy.

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