我已经在Ubuntu 16上使用Capistrano，Nginx和Phusion Passenger将Rails应用程序部署到数字海洋，我收到以下错误：
sudo tail /var/log/nginx/error.log
App 4752 stderr: from /home/deploy/maverick/shared/bundle/ruby/2.3.0/gems/railties-5.0.6/lib/rails/application.rb:246:in `env_config'
App 4752 stderr: from /home/deploy/maverick/shared/bundle/ruby/2.3.0/gems/railties-5.0.6/lib/rails/engine.rb:693:in `build_request'
App 4752 stderr: from /home/deploy/maverick/shared/bundle/ruby/2.3.0/gems/railties-5.0.6/lib/rails/application.rb:521:in `build_request'
App 4752 stderr: from /home/deploy/maverick/shared/bundle/ruby/2.3.0/gems/railties-5.0.6/lib/rails/engine.rb:521:in `call'
App 4752 stderr: from /usr/lib/ruby/vendor_ruby/phusion_passenger/rack/thread_handler_extension.rb:97:in `process_request'
App 4752 stderr: from /usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:152:in`accept_and_process_next_request'
App 4752 stderr: from /usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:113:in `main_loop'
App 4752 stderr: from /usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler.rb:416:in `block (3 levels) in start_threads'
App 4752 stderr: from /usr/lib/ruby/vendor_ruby/phusion_passenger/utils.rb:113:in `block in create_thread_and_abort_on_exception'
[ W 2017-12-09 07:14:23.2585 25154/T4 age/Cor/Con/InternalUtils.cpp:96 ]:
[Client 1-5] Sending 502 response: application did not send a complete response