Cloudflare CDN wlwmanifest error

SiteImprove that we use for our website health has recently flagged as an error “520: Proxy Publisher Failure” on every page. When investigating the issue I found “When your site’s visitors see error 520 in their browser, it means Cloudflare is sending the message because your server returned an empty, unknown, or unexpected response.” Please assist. Thank you!

I wonder if some of the WP plugins you’re having installed somehow blocks or restricts the access to it, therefore Cloudflare receives some 5xx from the origin and shows 520 for that particular file :thinking:

Interesting, the rest of the site is working ok, no 520 error.

Wonder if it’s removed for security purpose :thinking:
May I ask if the file is existing and not missing at your server, just in case?

I have reviewed the wp-includes location and the file is included.

Error display page. This site can’t be reached

The webpage at might be temporarily down or it may have moved permanently to a new web address.


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