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Right, after a few Months I now have some time off so I was kinda thinking about finishing this project, but I still have this issue, so I am bumping this thread. Doing a bit more research it seems that Derpibooru does reply with a CORS Header but maybe not always. If I test “https://derpicdn.net/” then I get a CORS header, but checking an actual Image I don’t. This might totally be because that’s not how that works in the first place, but the point stands that I still get an Error when trying to request an Image.  
My only other idea for why this would be is that none of the Headers in the “Access-Control-Allow-Headers” part match the ones listed on the Unity Site but I don’t exactly know in depth what I am talking about so I might be making a super rookie Mistake.
 
I construct the URL for the Image using the “image” URl from the JSON Query with “https://” added at the front, so ie:  
“https://derpicdn.net/img/view/2012/1/2/0__artist+needed_safe_derpy+hooves_adventure+in+the+comments_bag_building_chair_cigar_derpibooru+legacy_eyes_featured+image_female_grin_gritted+teeth_h.jpg”
 
The error I get in my JavaScript Console is:  
Access to XMLHttpRequest at ‘https://derpicdn.net/img/view/2012/1/2/0__artist+needed_safe_derpy+hooves_adventure+in+the+comments_bag_building_chair_cigar_derpibooru+legacy_eyes_featured+image_female_grin_gritted+teeth_h.jpg’ from origin ‘http://localhost:52975’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.
 
Considering I can see “access-control-allow-origin *” on the test I am not sure what’s wrong here.  
I tried uploading it to itch.io and testing there and I get the same error.

Hi there /)
 
I hope this is the right category for this sort of question, apologies if not.  
I am a Hobby Game Developer and have recently been working on a Clop Game that uses Derpibooru and JSON Queries to retrieve Images fitting the Context. As it is the only Engine I know how to properly use I use Unity.
 
My original plan was to release this game as a WebGL Version so Users can simply play from their Browser, but I encountered an Error when testing my WebGL Build. It appears, that Derpibooru currently doesn’t allow Cross-origin resource sharing which the WWW Component of Unity needs to be enabled, when using the WebGL Version (Source from Unity Documentation). I have looked around on here and the only mention of it I have found is in the Privacy Policy, however it doesn’t really go into anything beyond mentioning that such a policy exists.
 
My question is simply what the exact policy is on CORS and if there are Hosts for which it is enabled (such as itch.io).
 
Thanks /)