The CORS (Cross-Origin Resource Sharing) protocol enables Web servers to send the Access-Control-Allow-Origin header and other response headers to tell browsers to relax the same-origin policy and allow cross-origin XHR/Fetch/Ajax requests. The CORS protocol is defined in https://fetch.spec.whatwg.org/

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The title may lead you to think that this post is another ranting post about the downside of a “Single Page Application”. It is more about shedding some light on the performance perspective to keep in mind while designing the SPA. Especially if your SPA consumes APIs from different domain services.