Self-hosting page leads to "Invalid path" from bytebin

[Cyclic3]

I've been trying to add functionality to find out which regions/chunks have the most mobs in them. Unfortunately, the bytebin seems to reject any request which doesn't have the Origin HTTP header set to https://spark.lucko.me.

I've got a working version of this functionality in Rust, because I can add the header manually there, but of course this cannot be done with client-side JS, such as the code in this repo.

This prevents me from running a development version which streams from the server I'm staff on, which therefore makes implementing and contributing this functionality to this repo impossible. Have I misunderstood the API, or is there something that can be done on the backend to get this to work?