使用 flask 时出现 404 Not found 错误

Question

我正在 python 使用 Flask 学习 Web 开发。该代码没有显示任何错误，但是当我运行它时，浏览器显示错误 - 404 未找到。代码：

from flask import Flask, redirect, url_for
app = Flask(__name__)
@app.route('/admin/')
def hello_admin():
   return 'Hello Admin'
@app.route('/guest/<guest>')
def hello_guest(guest):
   return 'Hello %s as Guest' % guest
@app.route('/user/<name>')
def hello_user(name):
   if name =='admin':
      return redirect(url_for('hello_admin'))
   else:
      return redirect(url_for('hello_guest',guest = name))
if __name__ == '__main__':
   app.run(debug=True)

Chrome 中的输出：未找到在服务器上找不到请求的 URL。如果您手动输入 URL，请检查拼写并重试

Answer 1

来自Flask documentation：

An important detail to keep in mind is how Flask deals with trailing slashes. The idea is to keep each URL unique so the following rules apply:

If a rule ends with a slash and is requested without a slash by the user, the user is automatically redirected to the same page with a trailing slash attached.

If a rule does not end with a trailing slash and the user requests the page with a trailing slash, a 404 not found is raised

IMO，你可能会遇到第二种情况。

使用 flask 时出现 404 Not found 错误

404 Not found error while using flask

error-handling

flask

http-status-code-404

python-3.x