Routing

Routing is used to bind URLs with view functions, determining which code handles user access to specific paths.

Basic Usage:

python

@app.route("/")
def index():
    return "Index"

@app.get("/hello")
def hello():
    return "Hello"

@app.route("/submit", methods=["POST"])  # Multiple methods

URL Parameters:

python

@app.get("/user/<username>")
def profile(username):
    return f"User: {username}"

@app.get("/post/<int:post_id>")
def post_detail(post_id):
    return f"Post #{post_id}"

Building URLs:

python

from flask import url_for
url_for("index")
url_for("post_detail", post_id=123)

Redirect:

python

from flask import redirect
return redirect(url_for("index"), code=302)

Custom Converters: Used for regex or complex matching (advanced topic omitted).

Route Order: Matches in registration order, try to avoid overlapping/ambiguous paths.

Routing ​

Routing