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.