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Webfuse is the product secretly advertised in that iframe tester. It seems to be a solution to proxy and manipulate iframes

Yes, it sends the url to webfuse.com for the proxy test and to a ws21.webfuse.com host for a session data that also contains the url. They also open a web socket to ws21.webfuse.com that also contains the url.

Ooh, and to example-org-p.webfuse.com to actually fetch the content for the proxy.

It's totally a lie that URLs are processed client-side only.

We sell augmented web proxy - and this website was built to demonstrate one of the use case of Webfuse, embed anything.

Regarding the about section, it has not been updated after the first version, indeed proxy test isn't client side only.