Match an arbitrary path, or the empty string, without adding multiple Flask route decorators

Question

I want to capture all urls beginning with the prefix /stuff, so that the following examples match: /users, /users/, and /users/6

Answer 1

It's reasonable to assign multiple rules to the same endpoint. That's the most straightforward solution.

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If you want one rule, you can write a custom converter to capture either the empty string or arbitrary data beginning with a slash.

from flask import Flask
from werkzeug.routing import BaseConverter

class WildcardConverter(BaseConverter):
    regex = r'(|/.*?)'
    weight = 200

app = Flask(__name__)
app.url_map.converters['wildcard'] = WildcardConverter

@app.route('/users<wildcard:path>')
def users(path):
    return path

c = app.test_client()
print(c.get('/users').data)  # b''
print(c.get('/users-no-prefix').data)  # (404 NOT FOUND)
print(c.get('/users/').data)  # b'/'
print(c.get('/users/400617/edit').data)  # b'/400617/edit'

If you actually want to match anything prefixed with /users, for example /users-no-slash/test, change the rule to be more permissive: regex = r'.*?'.