[bug] Dezoomify was unable to load tiles from IIIF, extension found the JSON file needed

[CodemasterTH]

Hello, i tried to download the zoomable image from http://www.fotografia.iccd.beniculturali.it/iiif/mirador.html?manifest=https://dati.beniculturali.it/media/manifest/1/P000229.
I used dezoomify extension and it found the IIIF metainformation file at http://2.42.229.81/iiif/2/1%2F449.TIF/info.json
When i click on dezoomify button, it gives the error:
Uncaught Error: Unable to load first tile: http://2.42.229.81/iiif/2/1%2F449.TIF/0,0,884,884/884,/0/default.jpg
Chrome version 90.0.4430.212

I didn't add this report as "new site support" because the site uses IIIF and the needed metainformation file was found.

[lovasoa]

Duplicate of #542

See the FAQ.

[lovasoa]

[CodemasterTH]

Thanks for the answer, the solution for the other issue worked well.
But regarding to the FAQ.
The error i posted here is not listed in the FAQ. It is the same solution for the "internet correction" error indeed, but "Uncaught Error: Unable to load first tile" is not the one listed.
Therefore i suggest you to update the FAQ to add it.