👀 Views: 38 💬 Answers: 1 📅 Created: 2025-06-06

google-cloud-storage flask signed-url Python

I'm reviewing some code and I'm stuck on something that should probably be simple. I've looked through the documentation and I'm still confused about I'm trying to generate a signed URL for accessing a private file in Google Cloud Storage using Python and Flask, but I keep getting a 403 Forbidden behavior when I attempt to access the signed URL. I'm using the `google-cloud-storage` library version `2.3.0`. Here's the code I'm using to generate the signed URL: ```python from google.cloud import storage from flask import Flask, jsonify import datetime app = Flask(__name__) @app.route('/generate-signed-url/<filename>', methods=['GET']) def generate_signed_url(filename): storage_client = storage.Client() bucket = storage_client.bucket('my-bucket') blob = bucket.blob(filename) expiration_time = datetime.datetime.utcnow() + datetime.timedelta(minutes=15) signed_url = blob.generate_signed_url(expiration=expiration_time, method='GET') return jsonify({'signed_url': signed_url}) ``` When I call this endpoint, I get a signed URL without any issues, but when I try to access the signed URL directly in the browser, I receive a `403 Forbidden` behavior. I've double-checked the permissions of the bucket as well as the IAM roles, and the service account has the `Storage Object Viewer` role which should allow access. I've also verified that the filename I'm using is correct. What might be causing this 403 behavior? Are there additional permissions I need to set for the signed URL to work? Also, I tried regenerating the signed URL multiple times and confirmed that the date and time settings on my server are correct to avoid potential issues with timestamp expiration. This is part of a larger web app I'm building. What's the best practice here? My team is using Python for this service. Could this be a known issue? This is happening in both development and production on Windows 11. I'd really appreciate any guidance on this. I'm working with Python in a Docker container on macOS. I'd really appreciate any guidance on this.