Mandrill API using Rails 4.2.5 Excon::Errors::SocketError - ruby-on-rails

Question

I am using Mandrill in my Rails app to send transactional e-mail. I use the 'mandrill-api' gem and I configured it according to the documentation.
It works fine on production but in local an error raides:
Unable to verify certificate, please set `Excon.defaults[:ssl_ca_path] = path_to_certs`,
`ENV['SSL_CERT_DIR'] = path_to_certs`, `Excon.defaults[:ssl_ca_file] = path_to_file`, `ENV['SSL_CERT_FILE'] = path_to_file`,
`Excon.defaults[:ssl_verify_callback] = callback` (see OpenSSL::SSL::SSLContext#verify_callback),
or `Excon.defaults[:ssl_verify_peer] = false` (less secure).
I don't understand why it is working on production and not in local?
Here is my config:
gemfile
source 'https://rubygems.org'
ruby '2.2.3'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.5'
# Use postgresql as the database for Active Record
gem 'pg', '~> 0.15'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby
# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'
# Use Unicorn as the app server
# gem 'unicorn'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
#gem 'byebug'
gem 'better_errors'
gem 'binding_of_caller'
gem 'quiet_assets'
gem 'pry-rails'
end
group :development do
# Access an IRB console on exception pages or by using <%= console %> in views
gem 'web-console', '~> 2.0'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
end
group :production do
gem 'rails_12factor'
end
# Privacy
gem 'figaro'
# Heroku
gem 'heroku'
# Private access!
gem 'lockup'
# Mails
gem 'mandrill-api'
development.rb
Rails.application.configure do
# Settings specified here will take precedence over those in config/application.rb.
# In the development environment your application's code is reloaded on
# every request. This slows down response time but is perfect for development
# since you don't have to restart the web server when you make code changes.
config.cache_classes = false
# Do not eager load code on boot.
config.eager_load = false
# Show full error reports and disable caching.
config.consider_all_requests_local = true
config.action_controller.perform_caching = false
# Don't care if the mailer can't send.
config.action_mailer.raise_delivery_errors = false
# Print deprecation notices to the Rails logger.
config.active_support.deprecation = :log
# Raise an error on page load if there are pending migrations.
config.active_record.migration_error = :page_load
# Debug mode disables concatenation and preprocessing of assets.
# This option may cause significant delays in view rendering with a large
# number of complex assets.
config.assets.debug = true
# Asset digests allow you to set far-future HTTP expiration dates on all assets,
# yet still be able to expire them through the digest params.
config.assets.digest = true
# Adds additional error checking when serving assets at runtime.
# Checks for improperly declared sprockets dependencies.
# Raises helpful error messages.
config.assets.raise_runtime_errors = true
# Raises error for missing translations
# config.action_view.raise_on_missing_translations = true
# Mails
config.action_mailer.raise_delivery_errors = true
config.action_mailer.perform_deliveries = true
# Devise
#config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
# TODO: do it with a template: http://blog.nvisium.com/2014/10/mandrill-devise-and-mailchimp-templates.html
config.action_mailer.smtp_settings = {
:address => 'smtp.mandrillapp.com',
:port => 587, # ports 587 and 2525 are also supported with STARTTLS
:enable_starttls_auto => true, # detects and uses STARTTLS
:user_name => ENV['MANDRILL_USERNAME'],
:password => ENV['MANDRILL_API_KEY'], # SMTP password is any valid API key
:authentication => 'login', # Mandrill supports 'plain' or 'login'
:domain => ENV['HOST'], # your domain to identify your server when connecting
}
end
mandrill.rb
require 'mandrill'
# Use an environment variable instead of placing the key in source code
MANDRILL = Mandrill::API.new ENV['MANDRILL_API_KEY'], true
Fonction raising the error only in local:
def send_short_email(subject, message, receiver)
inner_message = {
to: [{name: receiver.name, type: 'to', email: receiver.email}],
subject: subject,
html: message,
text: message,
from_email: ENV['DEFAULT_EMAIL_SENDER']
}
MANDRILL.messages.send inner_message
logger.debug inner_message
end
I tried changing settings, hosts or API key but nothing works. And there is no mention of this problem in the gem documentation.
Do you have an idea?
Thanks!
Céline

Answer 1

As suggested by Casper in its comment, I edited my development.rb file to skip certificate verification.
development.rb
require 'excon'
Rails.application.configure do
...
Excon.defaults[:ssl_verify_peer] = false
end