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Invalid response line returned from server: HTTP/2 200

SOLVED

Re: Invalid response line returned from server: HTTP/2 200

Make sure Curl.php is Curl not curl, that's what tripped me up.

It boggles the mind how Magento can have these bugs, still not fixed in 2.3

Re: Invalid response line returned from server: HTTP/2 200

Curlback.php thing worked for me on magento 2.3 thanks