Resolving Cross-Domain Ajax for Improved API Performance

In the midst of developing an infrastructure to support a gaming platform that will cater to a large user base, performance is our top priority. We are striving to parallelize the architecture by running APIs, databases, and applications on separate servers for horizontal scalability.

The biggest challenge we're facing lies in one particular application - a web app. This app requires access to models from our centralized API, but encounters issues with the same origin policy on older browsers.

While mobile clients have no trouble connecting, web browsers struggle due to limited CORS support for certain HTTP verbs like PUT and DELETE. Our proposed workarounds involve either rewriting the API for more abstraction (which may impact development time and performance) or utilizing JSONP for POST requests, potentially adding latency through a proxy.

Ultimately, we need to determine if these options are our only choices or if there are alternative solutions worth exploring. Which approach would best suit a gaming platform like ours?

javascriptajaxperformanceapirest

Answer №1

Have you considered trying out JSONP? JSONP allows you to wrap a JSON response so that it can be loaded as a script tag, bypassing issues with the same origin policy.

As for performance concerns specific to your application, it would be difficult to assess without a deeper understanding of the app. However, in terms of server performance, using JSONP should not significantly impact it, as the main difference is simply concatenating an extra string.

Answer №2

Don't let SOP be a hurdle in your way. Utilize JSONP for cross-domain requests. Adding a callback method around the response shouldn't cause any issues on the server-side and should seamlessly integrate with the rest of your application without compromising REST principles. When it comes to PUT and DELETE methods, simply send a POST request and include the X-HTTP-Method-Override header specifying the desired method. Your server-side webservice handler can interpret this header and process the request accordingly, all while remaining hidden from the rest of the application.

Answer №3

Although JSONP is widely supported, it can be considered a bit of a workaround with some drawbacks such as the inability to capture errors.

The reason JSONP functions universally is because requests made through the script tag fall under the category of a "simple request", according to the CORS specification.

Instead of relying on JSONP, it might be beneficial to adapt your API (particularly the most frequently used parts) to align with the requirements of a simple request. This will allow you to handle errors effectively without the performance implications of preflight requests.

In cases where preflight requests are necessary, consider caching the responses to streamline the process.

If you're interested in learning more about this technique, check out my detailed article titled Two Strategies for Crossing Origins with Performance in Mind

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