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Configure `boto3` for R2

Example of how to configure `boto3` to use R2.
You must generate an Access Key before getting started. All examples will utilize access_key_id and access_key_secret variables which represent the Access Key ID and Secret Access Key values you generated.

You must configure boto3 to use a preconstructed endpoint_url value. This can be done through any boto3 usage that accepts connection arguments; for example:

import boto3
s3 = boto3.resource('s3',
endpoint_url = 'https://<accountid>.r2.cloudflarestorage.com',
aws_access_key_id = '<access_key_id>',
aws_secret_access_key = '<access_key_secret>'
)

You may, however, omit the aws_access_key_id and aws_secret_access_key arguments and allow boto3 to rely on the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables instead.

An example script may look like the following:

main.py
import boto3
s3 = boto3.resource('s3',
endpoint_url = 'https://<accountid>.r2.cloudflarestorage.com',
aws_access_key_id = '<access_key_id>',
aws_secret_access_key = '<access_key_secret>'
)
print('Buckets:')
for bucket in s3.buckets.all():
print(' - ', bucket.name)
bucket = s3.Bucket('my-bucket-name')
print('Objects:')
for item in bucket.objects.all():
print(' - ', item.key)
$ python main.py
# Buckets:
# - user-uploads
# - my-bucket-name
# Objects:
# - cat.png
# - todos.txt