Python Flask - URL-encoded leading slashes calling 404 or 405

Question

My application often uses URL-encoded strings as a URL parameter. Often these lines look like slash tracks. The IE /file/foo. In the bulb, I have an endpoint that takes a path parameter where I send the URL of the encoded path. So I have something similar:

import flask
app = flask.Flask("Hello World")

@app.route("/blah/<path:argument>", methods=["GET"])
def foo(argument):
    return "GOT: %s" % argument

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

This works fine if I find this URL:

http://localhost:5000/blah/cats%2F

returns:

GOT: cats/

But the leading slash with% 2F fails with 404 in the case of GET and 405 in the case of POST. In other words, these are 404s:

http://localhost:5000/blah/%2Fcats

In my research on this issue, I was lucky here that the URL encoding was sufficient to fix the problem. However, it is not.

Answer 1

, Werkzeug URL-. , - . :

• https://github.com/mitsuhiko/flask/issues/900
• https://github.com/mitsuhiko/werkzeug/pull/478

, .

, - Martijn .

Answer 2

PathConverter :

import flask
app = flask.Flask("Hello World")

@app.route("/blah/<path:argument>", methods=["GET"])
@app.route("/blah//<path:argument>", methods=["GET"])
def foo(argument):
    return "GOT: %s" % argument

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

:

http://localhost:5000/blah/%2Fcats

:

GOT: cats

:

http://localhost:5000/blah//cats

:

GOT: cats

( ) , , , SO: