MCAvatar:
/MCAvatar/?[username={用户名}][uuid={UUID}][format=png|jpg]优先使用UUID判断, UUID支持带斜杠与不带斜杠两种模式.format默认为png, 可选jpg.
或者
/MCAvatar/{uuid|username}/{用户名|UUID}.{format}例如:
/MCAvatar/?username=KawaiiZapic
/MCAvatar/username/KawaiiZapic.png
/MCAvatar/?username=KawaiiZapic&format=jpg
/MCAvatar/?uuid=c99ca793-af8e-4a74-a198-61f0ce9422dc
/MCAvatar/uuid/c99ca793-af8e-4a74-a198-61f0ce9422dc.jpg
