启动flask时报错：
ValueError: urls must start with a leading slash
错误代码：
bp = Blueprint('cms',__name__,subdomain='cms',url_prefix='cms')
正确代码：
bp = Blueprint('cms',__name__,subdomain='cms',url_prefix='/cms')
Flask启动时报错：ValueError: urls must start with a leading slash
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ValueError: urls must start with a leading slash
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