Best way to parse the user_agent property?

[SuperSajuuk]

Hi all, I'm looking to do some work with the user_agent property on a request object [I don't subclass Request, but use the default implementation]. I noticed in the documentation that this only contains a string property that must be parsed and online, I found a simple solution to parse that with a subclassed UserAgent. However, the example also suggested I needed to subclass Request to use that subclass.

Does anyone know how I would use the default user_agent property without requiring the Request to be subclassed in order to use a custom parser for the user agent? Thank you! ❤

[tachyondecay]

You don't need to subclass Request, but you do need to subclass werkzeug.user_agent.UserAgent. Then you can set app.request_class.user_agent_class to be your new user agent class, like so:

from flask import Flask, request
from werkzeug.user_agent import UserAgent


class NewUserAgent(UserAgent):
    def new_method(self):
        return f"Hello, world, here is your user agent: {self.string}"


app = Flask(__name__)
app.request_class.user_agent_class = NewUserAgent


@app.route("/")
def index():
    return request.user_agent.new_method()

[SuperSajuuk]

Thanks! That'll help me a lot 👍