I seem to be getting this message after i updated to Magento 2.1.7 - it only displays on the contact page when someone submits the form.

Invalid response line returned from server: HTTP/2 200

I see this in the magento log file:

main.CRITICAL: Notice: Array to string conversion in /home/xxx/public_html/vendor/magento/module-catalog/Block/Product/View/Attributes.php on line 83 [] []

  • Have you check magento log file? Nov 26, 2018 at 14:19
  • Please check my ans. Dec 6, 2018 at 11:16

1 Answer 1


I was stuck in Magento 2.3.3 extension manager and just replaced

!2 with <2

and it worked.

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