What sets apart a script request from an xhr request?

Could you please clarify the difference between sending a request through a script tag, an iframe, and an xhr request? Are they all types of HTTP requests? Can one replace the other?

Answer №1

Are all of them HTTP requests?

Affirmative.

Can they be interchanged with one another?

No, typically not. For example: You are able to load a script using a script tag from any source, but usually you can only use Ajax (XHR, fetch, etc.) to fetch data from the same origin due to limitations imposed by the Same Origin Policy. (This restriction may be relaxed by the server providing the data through Cross-Origin Resource Sharing.) (Accessing content from a cross-origin iframe is subject to similar restrictions.)

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