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Johan Bové

Hi Tilman, about the "unfurl" URLS - I must admit I'm not sure entirely how it works. The Known CMS I use was prepared mostly by Marcus Povey (https://github.com/mapkyca) and was build by other developers. I only changed the template a bit. I will have a look in the source code and see if I can dig up how it works.
There is also an article here about what "unfurling" is about https://indieweb.org/link-preview

All of the Known source code can be found here: https://github.com/idno/known

Update:

So as I understand it, the Known PHP system will parse through post body content and it will find URLS to external sites. The application will then do a get request to the external link and it will parse the response it will get back and it will look for any "schematic" data it can find, mostly micro-formats.