Cannot instantiate an Aws::S3::Encryption::Client with a passed :region option; only works when ENV['AWS_DEFAULT_REGION'] is set

[apurvis]

key = OpenSSL::PKey::RSA.new(1024)
region = 'us-east-1'

s3_client_options = {
  region: region,
  credentials: Aws::Credentials.new(access_key, secret_key),
  encryption_key: key
}

s3_client = Aws::S3::Encryption::Client.new(s3_client_options)
=> Aws::Errors::MissingRegionError: missing region; use :region option or export region name to ENV['AWS_REGION']
    from /data/warehouse/shared/bundle/ruby/2.1.0/gems/aws-sdk-core-2.0.38/lib/aws-sdk-core/plugins/regional_endpoint.rb:30:in `after_initialize'
    from /data/warehouse/shared/bundle/ruby/2.1.0/gems/aws-sdk-core-2.0.38/lib/seahorse/client/base.rb:86:in `block in after_initialize'
    from /data/warehouse/shared/bundle/ruby/2.1.0/gems/aws-sdk-core-2.0.38/lib/seahorse/client/base.rb:85:in `each'
    from /data/warehouse/shared/bundle/ruby/2.1.0/gems/aws-sdk-core-2.0.38/lib/seahorse/client/base.rb:85:in `after_initialize'
    from /data/warehouse/shared/bundle/ruby/2.1.0/gems/aws-sdk-core-2.0.38/lib/seahorse/client/base.rb:23:in `initialize'
    from /data/warehouse/shared/bundle/ruby/2.1.0/gems/aws-sdk-core-2.0.38/lib/aws-sdk-core/client_stubs.rb:19:in `initialize'
    from /data/warehouse/shared/bundle/ruby/2.1.0/gems/aws-sdk-core-2.0.38/lib/seahorse/client/base.rb:107:in `new'
    from /data/warehouse/shared/bundle/ruby/2.1.0/gems/aws-sdk-resources-2.0.38/lib/aws-sdk-resources/services/s3/encryption/client.rb:183:in `initialize'
    from (irb):13:in `new'
    from (irb):13
    from /data/warehouse/shared/bundle/ruby/2.1.0/gems/railties-3.2.19/lib/rails/commands/console.rb:47:in `start'
    from /data/warehouse/shared/bundle/ruby/2.1.0/gems/railties-3.2.19/lib/rails/commands/console.rb:8:in `start'
    from /data/warehouse/shared/bundle/ruby/2.1.0/gems/railties-3.2.19/lib/rails/commands.rb:41:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

irb(main):016:0* ENV['AWS_DEFAULT_REGION'] = region
=> "us-east-1"

irb(main):017:0> s3_client = Aws::S3::Encryption::Client.new(s3_client_options)
=> #<Aws::S3::Encryption::Client:0x007f331e5f8130 @client=#<Aws::S3::Client>, @key_provider=#<Aws::S3::Encryption::DefaultKeyProvider:0x007f331e5cdfc0 @encryption_materials=#<Aws::S3::Encryption::Materials:0x007f331e5c2058 @key=#<OpenSSL::PKey::RSA:0x007f3321de9c88>, @description="{}">>, @envelope_location=:metadata, @instruction_file_suffix=".instruction">

[apurvis]

closing; moved to new repo