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I suddenly get "ERR_INVALID_RESPONSE" on my website. I have no clue how to debug it. Nothing new is added to the servers error log if I attempt to reload.

I tried clearing the cache.

I also set the rights with:

find var generated vendor pub/static pub/media app/etc -type f -exec chmod u+w {} + && find var generated vendor pub/static pub/media app/etc -type d -exec chmod u+w {} + && chmod u+x bin/magento

It started after changing deploy mode from production to developer.

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  • did you try to execute setup:upgrade and setup:di:compile ? – Yannick Waelkens Sep 3 '20 at 11:43
  • Yes, did not helped. – Black Sep 3 '20 at 12:10
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I noticed that if I change back to production mode, then it works again...

So it seems to be impossible to change back from production to developer or default mode.

I will report it as a bug.

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