Rails i18n if I use unicorn and nginx as a application server doesnt work

Question

When I run my app using default server, and set locale from subdomain, i18n works perfectly to "en" and "ja". 服务器运行我的应用程序，并从子域设置区域设置时，i18n完美地适用于“ en”和“ ja”。
However, when I use to run my app, i18n doesnt work like it does in WEBrick. 运行我的应用程序时，i18n无法像在WEBrick中那样工作。

I write below codes to set locale from subdomain;

 def set_locale                                          
    I18n.locale = params[:locale] || I18n.default_locale  
     if request.host.starts_with? "en."                    
      I18n.locale = "en"                                  
     else                                                  
      I18n.locale = "ja"                                  
     end                                                   
 end

What am I missing here?
My settings for unicorn and nginx are almost default except I changed the app name or the proxy_pass to app in nginx.conf.
Could anyone please teach me how to make i18n work?I'm stack all day....
Please excuse my poor English skill...
Thank you in advance.

Answer 1

Try adding the following line to your Nginx config inside your location @app-name { } or above your proxy_pass config:

proxy_set_header Host $http_host;

Rails will be sent the proxy_pass setting as the host if this missing from your Nginx config.