Routes With Custom Domains Using Flask

Question

My web app assigns a subdomain to users and optionally allows them to use a custom domain. This works except when the user visits their custom domain for a route without including a trailing slash.

GET requests to this url works as expected: http://user.example.com:5000/book/12345/

GET requests to this url works as expected: http://custom.com:5000/book/12345/

GET requests to this url attempt to redirect, but fail: http://custom.com:5000/book/12345

Flask ends up redirecting the browser to this url which, of course, doesn't work: http://<invalid>.example.com:5000/book/12345/

Is there a different way that I should handle custom domains? Here's a complete minimal example to reproduce this. I have set custom.com, example.com. and user.example.com to point to 127.0.0.1 in my /etc/hosts file in my development environment so that Flask receives the request.

from flask import Flask

app = Flask(__name__)

server = app.config['SERVER_NAME'] = 'example.com:5000'

@app.route('/', subdomain="<subdomain>")
@app.route('/')
def index(subdomain=None):

    return ("index")

@app.route('/book/<book_id>/', subdomain="<subdomain>")
@app.route('/book/<book_id>/')
def posts(post_id, subdomain=None):

    return (book_id)


if __name__ == '__main__':
    app.run(host='example.com', debug=True)

korylprince · Accepted Answer · 2013-11-09 02:37:15Z

2

I'm not sure that's possible. host matching and subdomain matching are mutually exclusive (look at host matching parameter).

I'd love to be wrong though.

One way around this issue that I can think of is to use something in front of Flask (say nginx) that points custom.com to custom.com._custom.example.com or something like that. In your code you could create a custom url_for function that would recognize this as a custom domain. I would ask on the Flask mailing list as they would be able to give you a solid answer.

answered Nov 9, 2013 at 2:37

korylprince

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2 Comments

Raj Over a year ago

That's a good suggestion. I just did emailed the Flask list. Thanks.

korylprince Over a year ago

Please let us know the answer you get.

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