Can't route to "/login" with flask?

Question

When I type /login as url,it will go wrong

For example:

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

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

if __name__== "__main__":
  app.run()

The error turn out to be like this:

Not Found.
The requested URL was not found on the server.

When I replace /login with /login/ or any other words like /log , it will be all right. How does that happen?

Solution

Please read the flask quickstart Unique URLs / Redirection Behavior, URL canonicalization and Trailing slash in URLs - which style is preferred?

Comments

[winoi]

But why it automatically replace "/login" with "/login/"? And then the browser will not find the page.

[Joe]

Please read flask quickstart Unique URLs / Redirection Behavior part, it has explained the reason why flask do this way.

[Joe]

For you given code, I can access http://127.0.0.1:5000/login,it will not redirect to http://127.0.0.1:5000/login/; and when I try to acess http://127.0.0.1:5000/login/, it report 404 error. It is in line with Unique URLs / Redirection Behavior.

[winoi]

It's all right now. "127.0.0.1:5000/login" was recorded in the browser.So when I type"127.0.0.1:5000/login" , it will add "/". It's the brower that troubles me. Thank you for your help.