Trouble Implementing OAuth2 with Google in a Flask App for User Authentication
I'm dealing with I keep running into I'm currently integrating Google OAuth2 into my Flask application for user authentication, but I'm running into issues with the callback handling..... I followed the documentation and set up my credentials correctly on the Google Developer Console. However, when I attempt to log in, I'm redirected back to my Flask app and receive a `400 Bad Request` behavior with the message `redirect_uri_mismatch`. It seems like the redirect URI is not matching what I registered on Google. Here’s the relevant portion of my code where I'm setting up the OAuth2 flow using Flask-Dance: ```python from flask import Flask, redirect, url_for from flask_dance.contrib.google import make_google_blueprint, google app = Flask(__name__) app.secret_key = "supersekrit" google_bp = make_google_blueprint(client_id='YOUR_CLIENT_ID', client_secret='YOUR_CLIENT_SECRET', redirect_to='google_login') app.register_blueprint(google_bp, url_prefix='/google_login') @app.route('/') def index(): if not google.authorized: return redirect(url_for('google.login')) resp = google.get('/plus/v1/people/me') assert resp.ok, resp.text return 'You are connected as: {0}'.format(resp.json()['displayName']) ``` For the redirect URI, I've configured `http://localhost:5000/google_login/callback` in the Google Developer Console. I’ve also checked my application's URL and made sure it's correct. I tried running `flask run` with different port numbers, but the scenario continues. Any insights on what might be going wrong? Could it be an scenario with the URL encoding or something else in the Flask-Dance setup? Thanks in advance for your help! I'm working on a microservice that needs to handle this. What's the correct way to implement this? Thanks for your help in advance!