Is the value of the 'lengthComputable' attribute always false when loading the glb model?

Questions
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Is the value of the ‘lengthComputable’ attribute always false when loading the glb model? What should I do if I want to calculate the progress of loading the glb model

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LengthComputable will get its value from the underlying XMLHttpRequest: ProgressEvent: lengthComputable property - Web APIs | MDN (mozilla.org). From this javascript - Why is ProgressEvent.lengthComputable false? - Stack Overflow it seems good to check if the Content-Length property is being returned.

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