What are common causes of 'TypeError: Network request failed'?

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Grade: Education Subject: Support
What are common causes of 'TypeError: Network request failed'?
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Several factors can cause this: 1) Network connectivity issues (no internet connection). 2) Incorrect API endpoint URL. 3) CORS (Cross-Origin Resource Sharing) problems – the server doesn't allow requests from your origin. 4) Server-side errors (the API is down or returning an error). 5) Request timeouts. 6) Firewall restrictions.