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The onreadystatechange Event
- Defines the function to be called when the readyState Property changes
- Returns the status-number of a request
- 200: "OK"
- 403: "Forbidden"
- 404: "Not Found"
AJAX>XMLHttpRequest.onreadystatechange
https://www.w3schools.com/tags/ref_httpmessages.asp
This is just a few of the more popular Status messages for all of them you can visit: