• The session is unavailable because no secret key was set. · Issue #107 · pallets-eco/flask-session (github.com)

การอัพโหลดไฟล์ จำเป็นต้องมีการกำหนดค่า SECRET_KEY ไม่งั้นจะ error ว่า RuntimeError: The session is unavailable because no secret key was set. Set the secret_key on the application to something unique and secret.

# save this as app.py

from flask import Flask
from flask import session
import os

app = Flask(__name__)

app.config.update(SECRET_KEY=os.urandom(24))
app.config.from_object(__name__)

@app.route("/")
def hello():
    return "Hello, World!"

if __name__ == "__main__":
    with app.test_request_context("/"):
        session["key"] = "value"