I had the same issue, this indeed fixed it. This also fixed an issue with the desktop app trying to connect to my server. It had been saying that my server was not a valid Fluxer instance, as it was annoyed that it was returning html instead of json, but setting this seems to have resolved that. The desktop client does recognize it as a fluxer instance now, but it just crashes when you try to actually log in to it. Though, I believe that's a known issue that they're fixing in a canary build soon
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Comment by @G0D200