Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve favicon/apple-touch-icon-144x144.png, which is not a DOI.
favicon/apple-touch-icon-144x144.png may be a Handle (DOIs are a special sort of Handle). If favicon/apple-touch-icon-144x144.png is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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