My first ActiveStorage project was working fine on development (puma only) but on production (nginx/puma), i have an issue for downloading big files that appear as truncated files.

For instance, an uploaded file sized 24.1 MB gives a 5 MB (truncated) download.

I mostly upload pdf files, uploaded files are complete (checked on server) & the preview works fine.

All environments use the config.active_storage.service = :local

config/storage.yml

local:

  service: Disk

  root: <%= Rails.root.join("storage") %>

Download url is generated using rails_blob_path(document.doc, disposition: :inline)

I suspect an option or parameter in puma or nginx that makes downloading the full files fail. As of now I cannot see any error in logs.

/etc/nginx/sites-available/default.conf

upstream app {

    # Path to Puma SOCK file, as defined previously

    server unix:/home/deploy/rails/shared/sockets/puma.sock fail_timeout=0;

}



server {

        listen 80;



        root /home/deploy/rails/public;



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



        # Make site accessible from http://localhost/

        server_name localhost;



        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;

        keepalive_timeout 10;

        client_max_body_size 4G;

}

Rails config/puma.rb

# Default to production

rails_env = ENV['RAILS_ENV'] || "production"

environment rails_env

# Change to match your CPU core count

if rails_env == 'production'

  workers 2

else

  workers 1

end



# Min and Max threads per worker

threads 1, 6



app_dir = File.expand_path("../..", __FILE__)

shared_dir = "#{app_dir}/shared"



if rails_env == 'production'

  # Set up socket location

  bind "unix://#{shared_dir}/sockets/puma.sock"



  # Logging

  stdout_redirect "#{shared_dir}/log/puma.stdout.log", "#{shared_dir}/log/puma.stderr.log", true



  # Set master PID and state locations

  pidfile "#{shared_dir}/pids/puma.pid"

  state_path "#{shared_dir}/pids/puma.state"

  activate_control_app



  on_worker_boot do

    require "active_record"

    ActiveRecord::Base.connection.disconnect! rescue ActiveRecord::ConnectionNotEstablished

    ActiveRecord::Base.establish_connection(YAML.load_file("#{app_dir}/config/database.yml")[rails_env])

  end

end

Use proxy_http_version 1.1;

By default, nginx uses HTTP 1.0 for proxying, which does not support chunked transfer encoding.

http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_http_version