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Demo apps to illustrate alternative approaches for cross-domain requests in client-side Javascript.

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Cross-Domain requests in Javascript

A detailed explanation can be found on my blog

In order to run the examples:

  • Install node.
  • Execute npm install in the root folder of the project (where the package.json file is located). This will install all the required dependencies.
  • Execute run_servers.bat in one of the subfolders, this will start 2 web servers with a different origin (the port numbers differ).
  • Use your browser to navigate to localhost:3000. The web pages will perform cross-domain requests on page load.
  • Inspect the results in your browser window and in the server consoles.

The project illustrates the following scenarios:

  1. CrossDomainNotAllowedByDefault: Demonstrates failing cross-origin requests.
  2. JSONP: Demonstrates a simple cross-origin GET request with a server that supports JSONP.
  3. Proxy: Demonstrates a work-around for cross-origin requests by having a local proxy server in the same domain.
  4. CORS: Demonstrates a whitelist approach servers can use to allow cross-origin requests.
  5. iframe and postMessage: demonstrates a sandboxed client-side proxy mechanism using window.postMessage and iframes. Note that this approach can also be used with other cross-domain request techniques to limit potential security leaks.

The examples are written in express, a web application framework for node.js and some jQuery on the client.

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