Getting an error `127.0.0.1' is not a valid domain after every request on my rails app running on nginx server with unicorn. What to check?

****## Server Configuration

upstream app { server unix:/home/deploy/project/shared/sockets/unicorn.sock fail_timeout=0; }

server { listen 80; server_name *.mydomain;

root /home/deploy/project/current/public;

try_files $uri/index.html $uri @app;

location @app {
    proxy_pass http://app;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
}
error_page 500 502 503 504 /500.html;
client_max_body_size 4G;
keepalive_timeout 10;

}

****## Stack trace

…by-2.1.2/gems/public_suffix-1.5.1/lib/ public_suffix.rb: 62:in parse' …ploy/bookafy/app/controllers/ application_controller.rb: 72:in set_domain_variable’ …ser-timezone-rails-1.0.1/lib/ browser-timezone-rails.rb: 15:in set_time_zone' …1.2/gems/actionview-4.1.5/lib/action_view/ rendering.rb: 30:in process’ …ct-1.3.1/app/middleware/ recurring_select_middleware.rb: 24:in call' …ems/apipie-rails-0.3.6/lib/apipie/ static_dispatcher.rb: 65:in call’ …gems/ruby-2.1.2/gems/turnout-2.4.1/lib/rack/ turnout.rb: 25:in call' …uby-2.1.2/gems/omniauth-1.2.2/lib/omniauth/ strategy.rb: 186:in call!’ …uby-2.1.2/gems/omniauth-1.2.2/lib/omniauth/ strategy.rb: 164:in call' …uby-2.1.2/gems/omniauth-1.2.2/lib/omniauth/ strategy.rb: 186:in call!’ …uby-2.1.2/gems/omniauth-1.2.2/lib/omniauth/ strategy.rb: 164:in call' …uby-2.1.2/gems/omniauth-1.2.2/lib/omniauth/ strategy.rb: 186:in call!’ …uby-2.1.2/gems/omniauth-1.2.2/lib/omniauth/ strategy.rb: 164:in call' …ruby-2.1.2/gems/omniauth-1.2.2/lib/omniauth/ builder.rb: 59:in call’ …ms/apipie-rails-0.3.6/lib/apipie/extractor/ recorder.rb: 132:in call' …m/gems/ruby-2.1.2/gems/rack-1.5.5/lib/rack/ deflater.rb: 25:in call’ …ems/ruby-2.1.2/gems/warden-1.2.3/lib/warden/ manager.rb: 35:in block in call' …ems/ruby-2.1.2/gems/warden-1.2.3/lib/warden/ manager.rb: 34:in catch’ …ems/ruby-2.1.2/gems/warden-1.2.3/lib/warden/ manager.rb: 34:in call' …/.rvm/gems/ruby-2.1.2/gems/rack-1.5.5/lib/rack/ etag.rb: 23:in call’ …/ruby-2.1.2/gems/rack-1.5.5/lib/rack/ conditionalget.rb: 25:in call' …/.rvm/gems/ruby-2.1.2/gems/rack-1.5.5/lib/rack/ head.rb: 11:in call’ …-2.1.2/gems/rack-1.5.5/lib/rack/session/abstract/ id.rb: 225:in context' …-2.1.2/gems/rack-1.5.5/lib/rack/session/abstract/ id.rb: 220:in call’ …ruby-2.1.2/gems/quiet_assets-1.1.0/lib/ quiet_assets.rb: 27:in call_with_quiet_assets' …ms/request_store-1.2.0/lib/request_store/ middleware.rb: 8:in call’ …/ruby-2.1.2/gems/rack-1.5.5/lib/rack/ methodoverride.rb: 21:in call' …vm/gems/ruby-2.1.2/gems/rack-1.5.5/lib/rack/ runtime.rb: 17:in call’ …m/gems/ruby-2.1.2/gems/rack-1.5.5/lib/rack/ sendfile.rb: 112:in call' …by-2.1.2/gems/unicorn-5.5.0/lib/unicorn/ http_server.rb: 605:in process_client’ …vm/gems/ruby-2.1.2/gems/spawnling-2.1.6/lib/ patches.rb: 74:in process_client' …by-2.1.2/gems/unicorn-5.5.0/lib/unicorn/ http_server.rb: 700:in worker_loop’ …by-2.1.2/gems/unicorn-5.5.0/lib/unicorn/ http_server.rb: 548:in spawn_missing_workers' …by-2.1.2/gems/unicorn-5.5.0/lib/unicorn/ http_server.rb: 144:in start’