Export "ERR_HTTP2_PROTOCOL_ERROR"

[rockymenteng]

Hi All,

I've been trying to solve this issue for hours now but I cannot get to the bottom of it.

Exporting to XLS had been working fine for a long time now until suddenly it stopped working and produced this error "ERR_HTTP2_PROTOCOL_ERROR".

Or in full:
This site can’t be reached. The webpage at "xxxxxx" might be temporarily down or it may have moved permanently to a new web address.

I am on Laravel 8 and PHP 7.4. When i checked the nginx error log, it shows:
"upstream prematurely closed connection while reading upstream"

I am not sure how this happened. It's been working fine before and no changes were made. It still works locally on my testing environment, but not in production server.

Any ideas will be very much appreciated.

Thank you.