Flask framework learning: trailing slashes for routes

URL redirect behavior

The trailing slash of the route is different, for example:

from flask import Flaskapp = Flask(__name__)@app.route('/')def index():return 'index page'@app.route('/qwe')def test():return 'test'if __name__ == '__main__':app.run()

When accessing the route /qwe, the route should be written as /qwe, which can be accessed, but if it is written as /qwe/will report an error

/qweVisit

/qwe/Visit

The error code is 404: the resource corresponding to this url cannot be found

If the code is modified to:

@app.route('/qwe/')# followed by a slashdef test():return 'test'

Both access methods are available, you can try it yourself.

Notice that when you enter /qwe in the browser address bar, it will automatically become /qwe/, this is because flask automatically redirects, check the returnStatus code:

means that the accessed /qwe is permanently transferred to /qwe/, so the redirection is performed automatically.

So if the route does not have / at the end, you cannot add a slash when accessing it.

In addition, if you modify the code now to @app.route('/qwe'), remove the slashes and run it again, there will always be an error, because it keeps redirecting, then clear the browserJust cache it.