Appendix D. Other cross-origin techniques
This appendix covers alternatives to CORS. Before CORS, the techniques described here could be used to make cross-origin requests. While CORS is the standard for modern web applications, these alternative techniques are useful for making cross-origin requests from older browsers.
Each technique follows a similar pattern, as illustrated in figure D.1. The client wants to make a request to a server that lives at a different origin. In between there is a proxy mechanism that processes the request from the client and sends it to the server.
Figure D.1. All cross-origin techniques follow a similar pattern.
figure D.1 will reappear in each section that follows to help highlight how each technique operates. ...
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