Deploy Flask

Leash detects Python apps by the presence of requirements.txt. Flask apps are auto-detected and served with gunicorn.

Detection

If your requirements.txt includes flask, Leash picks the Flask build strategy and uses gunicorn as the production server.

Example App

Expose a module-level app — gunicorn picks it up automatically. Don't call app.run(): that's the Flask dev server, not used in production.

from flask import Flask, jsonify

app = Flask(__name__)

@app.route("/")
def index():
    return "<h1>Hello from Leash!</h1>"

@app.route("/api/health")
def health():
    return jsonify({"status": "ok"})

Dependencies

flask
gunicorn

Deploy