Is it feasible, while working with XMLHttpRequest in JavaScript, to differentiate between these two types of errors: GET request completely failed/No 'Access-Control-Allow-Origin' header?
https://i.sstatic.net/Zas2z.png
It seems that the readyState and status properties of the XMLHttpRequest object do not provide a distinction. I attempted to utilize window.onerror to capture all errors, but it appears that these specific errors do not invoke the callback function.
To avoid encountering this error, it is crucial to take proactive measures before it happens. One effective method is to ensure that the server includes the domain you are attempting to access in your script to the Access-Control-Allow-Origin setting, thus eliminating the need for client-side troubleshooting.
If the error still occurs, consider attaching an error handler to the XMLHttpRequest object. By analyzing the error message, you may be able to identify the root cause of the issue; however, the main focus should be on resolving the problem rather than understanding its specifics from the client's perspective.
var oReq = new XMLHttpRequest();
oReq.addEventListener("error", transferFailed);
oReq.open();
function transferFailed(evt) {
console.log("An error occurred while transferring the file.");
}
For more details, refer to: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#Asynchronous_request
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