Sometimes first connection to Cloudflare proxied site will fail


My site is proxied in Cloudflare. Sometimes, I notice that the first connection to my site may fail. For example, when using AppVisor at to validate my PAD file and check the URLs of my site, such as, I will get the following error:

“We have received an unexpected result while parsing the contents of the file located at this URL. We have the data type [unknown], while it should be data type [text/html].”

If try again, then the error will disappear.

Why and how to fix this issue?

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