Nu Html Checker for https protocol gave an error message

for https protocol
IO Error : Premature end of chunk coded message body: closing chunk expected

But for http protocol
Document checking completed. No errors or warnings to show.

what is the problem?

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That’s certainly not unique to Cloudflare. Lots of HTTPS sites return this error. It doesn’t seem to break anything, but you’re certainly welcome to ask Support about this. I’d be interested to find out what they say.

To contact Cloudflare Customer Support, login & go to and select get more help. If you receive an automatic response that does not help you, please reply and indicate you need more help.

I have the identical issue on an Apache Virtual Host. When Cloudflare is paused for a domain, the error disappears.
I’ve opened a ticket with Cloudflare Support.

10 hours later: the problem seems to’ve magically disappeared…
:slight_smile: Thanks!

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