Can't connect to S3 buckets with periods in their name, when using Boto on Heroku

Question

We\'re getting a certificate error when trying to connect to our S3 bucket using Boto. Strangely, this only manifests itself when accessing a bucket with periods in its name

Answer 1

According to the relevant github issue, add this to the configuration:

[s3]
calling_format = boto.s3.connection.OrdinaryCallingFormat

Or, specify the calling_format while instantiating an S3Connection:

from boto.s3.connection import OrdinaryCallingFormat

conn = S3Connection(access_key, secret_key, calling_format=OrdinaryCallingFormat())

The code worked for you locally and didn't work on heroku, most likely, because of the different python versions used. I suspect you are using 2.7.9 runtime on heroku, which has enabled certificate checks for stdlib http clients.