Cloudflare detecting our MitM


We see a number of different issues depending on the web site. Below are a couple of examples




Often the an issue is only seen browsing a site & not often on the home/landing page.

Chrome reports errors such as error 1020 or


-“Uncaught (in promise) TypeError: Failed to fetch at Xt.window.fetch.window.fetch (index.js:28:1)”

On facebook buisness we are seeing: ‘This Page Isn’t Available Right Now’ message and the Chrome console spews out errors messages like “Response contained invalid JSON. Reason: Unexpected token in JSON at position 0”.

I undestand what you are saying about something specific but we monitor 10,000’s of websites everyday & we only get these types of errors on sites that use Cloudflare, also, none of the errors we are seeing are generated by our software but by the browser.

Our developers believe it is due to the fact that we are using an MitM & Cloudflare is recognising this & this is somehow affecting the communication.


Paul Braithwaite

t: +44 161 696 3446


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