无法用烧瓶路由到"/ login"?

win*_*noi 4 python url flask

当我输入/login网址时,它会出错

例如:

from flask import Flask ,url_for,render_template,request
app = Flask(__name__)

@app.route('/login')
def index():
  return "index"

if __name__== "__main__":
  app.run()
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错误结果是这样的:

Not Found.
The requested URL was not found on the server.
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当我/login/login/或替换任何其他单词时/log,它会没事的.这是怎么发生的?