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似乎是这样，BMCLAPI和MCBBS都无法访问这个API：
https://meta.fabricmc.net/v2/versions/loader/1.17.1 -> 200 https://bmclapi2.bangbang93.com/fabric-meta/v2/versions/loader/1.17.1 -> 404
Maven镜像似乎可以正常获取Fabric的东西，但是版本索引的确获取不到
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