The fundamental capabilities of the internet can be boiled down to one simple interaction: a call and a response. One machine (the client) sends requests to another machine (the server), which responds with a reply. This back-and-forth request-and-response cycle is how every phone, television, smart fridge, or computer sends and receives data.
However, there are several security risks inherent in this model, from application vulnerabilities to DDoS attacks. In this post, we’ll take a closer look at how Cross-Origin Resource Sharing, or CORS, mitigates these risks and how it operates. By working with a small Node.js app that interacts with several Salesforce APIs, we will see the differences in responses when CORS is enabled and disabled, as well as what effect it has on our client.
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