Why can't I set host name for action_mailer.default_url_options by Devise 3 and Rails 4?

Question

Some source of my config/environments/development.rb file

  config.action_mailer.default_url_options = { :host => 'myapp.apne1.nitrousbox.com' }
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.perform_deliveries = true
  config.action_mailer.default :charset => "utf-8"

  config.action_mailer.smtp_settings = {
    address: "smtp.mandrillapp.com",
    port: 25,
    domain: 'http://myapp.apne1.nitrousbox.com',
    authentication: "plain",
    enable_starttls_auto: true,
    user_name: ENV["MANDRILL_USERNAME"],
    password: ENV["MANDRILL_API_KEY"]
  }

The mail can send successfully.But the password reset link url likes:

https://users/password/edit?reset_password_token=XXXXXXXXXXXXXXXXXX

The host url myapp.apne1.nitrousbox.com disappeared! And http became https .

I had search the internet and find someone has the same issue.Somebody have lucky and their settings worked.I have tried that but the same result.

---

Error log:

ActionView::Template::Error (Missing host to link to! Please provide the :host parameter, set default_url_options[:host], or set :only_path to true):

---

Rails

4.1.0

Devise

3.4.0

Datetime

AD2014-11-02 00:00:00

---

[Edited the last day]

The password reset link(as devise's default):

<%= link_to 'Change password', edit_password_path(@resource, reset_password_token: @token) %>

Answer 1

Put:

Rails.application.routes.default_url_options[:host] = "myapp.apne1.nitrousbox.com"

In your config/production.rb file.