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quick start

###Unique URLs / Redirection Behavior
The following two rules differ in their use of a trailing slash.

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@app.route('/projects/')
def projects():
    return 'The project page'
@app.route('/about')
def about():
    return 'The about page'

The canonical URL for the projects endpoint has a trailing slash. It’s similar to a folder in a file system. If you access the URL without a trailing slash, Flask redirects you to the canonical URL with the trailing slash.

The canonical URL for the about endpoint does not have a trailing slash. It’s similar to the pathname of a file. Accessing the URL with a trailing slash produces a 404 “Not Found” error. This helps keep URLs unique for these resources, which helps search engines avoid indexing the same page twice.

reference

谢谢~