ruby on rails - Error when uploading large file with Paperclip and AWS -

my rails app on heroku allows user upload photo stored on amazon web services s3 using paperclip.

when photo's size above 1.5mb app seems time out. best way solve problem?

here stack trace if helps?

e, [2013-10-07t14:15:57.018396 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/static.rb:62:in `call' 2013-10-07t14:15:57.018974+00:00 app[web.2]: e, [2013-10-07t14:15:57.018430 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward' 2013-10-07t14:15:57.018974+00:00 app[web.2]: e, [2013-10-07t14:15:57.018772 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:143:in `pass' 2013-10-07t14:15:57.018974+00:00 app[web.2]: e, [2013-10-07t14:15:57.018946 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:71:in `call!' 2013-10-07t14:15:57.019152+00:00 app[web.2]: e, [2013-10-07t14:15:57.018983 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call' 2013-10-07t14:15:57.019152+00:00 app[web.2]: e, [2013-10-07t14:15:57.019100 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/airbrake-3.1.12/lib/airbrake/user_informer.rb:16:in `_call' 2013-10-07t14:15:57.019279+00:00 app[web.2]: e, [2013-10-07t14:15:57.019147 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/airbrake-3.1.12/lib/airbrake/user_informer.rb:12:in `call' 2013-10-07t14:15:57.019279+00:00 app[web.2]: e, [2013-10-07t14:15:57.019183 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-timeout-0.0.4/lib/rack/timeout.rb:16:in `block in call' 2013-10-07t14:15:57.019279+00:00 app[web.2]: e, [2013-10-07t14:15:57.019217 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-timeout-0.0.4/lib/rack/timeout.rb:16:in `call' 2013-10-07t14:15:57.019279+00:00 app[web.2]: e, [2013-10-07t14:15:57.019252 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/engine.rb:479:in `call' 2013-10-07t14:15:57.019469+00:00 app[web.2]: e, [2013-10-07t14:15:57.019326 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/application.rb:223:in `call' 2013-10-07t14:15:57.019469+00:00 app[web.2]: e, [2013-10-07t14:15:57.019369 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/railtie/configurable.rb:30:in `method_missing' 2013-10-07t14:15:57.019648+00:00 app[web.2]: e, [2013-10-07t14:15:57.019502 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:552:in `process_client' 2013-10-07t14:15:57.019710+00:00 app[web.2]: e, [2013-10-07t14:15:57.019594 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:632:in `worker_loop' 2013-10-07t14:15:57.020069+00:00 app[web.2]: e, [2013-10-07t14:15:57.019940 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:500:in `spawn_missing_workers' 2013-10-07t14:15:57.020154+00:00 app[web.2]: e, [2013-10-07t14:15:57.020083 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn/http_server.rb:142:in `start' 2013-10-07t14:15:57.020271+00:00 app[web.2]: e, [2013-10-07t14:15:57.020153 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/bin/unicorn:126:in `<top (required)>' 2013-10-07t14:15:57.020372+00:00 app[web.2]: e, [2013-10-07t14:15:57.020263 #5] error -- : /app/vendor/bundle/ruby/1.9.1/bin/unicorn:23:in `load' 2013-10-07t14:15:57.020484+00:00 app[web.2]: e, [2013-10-07t14:15:57.020370 #5] error -- : /app/vendor/bundle/ruby/1.9.1/bin/unicorn:23:in `<main>' 2013-10-07t14:15:57.022713+00:00 heroku[router]: at=info method=post path=/shares host=mentionengine.com fwd="105.228.65.98" dyno=web.2 connect=2ms service=15098ms status=500 bytes=0 2013-10-07t14:15:57.017996+00:00 app[web.2]: e, [2013-10-07t14:15:57.017963 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/multipart/parser.rb:116:in `get_current_head_and_filename_and_content_type_and_name_and_body' 2013-10-07t14:15:57.018284+00:00 app[web.2]: e, [2013-10-07t14:15:57.018362 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/lock.rb:15:in `call' 2013-10-07t14:15:57.018284+00:00 app[web.2]: e, [2013-10-07t14:15:57.018294 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/runtime.rb:17:in `call' 2013-10-07t14:15:57.017996+00:00 app[web.2]: e, [2013-10-07t14:15:57.017931 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn/tee_input.rb:84:in `read' 2013-10-07t14:15:57.017884+00:00 app[w eb.2]: e, [2013-10-07t14:15:57.017831 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn/stream_input.rb:51:in `kgio_wait_readable' 2013-10-07t14:15:57.018284+00:00 app[web.2]: e, [2013-10-07t14:15:57.018262 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/methodoverride.rb:14:in `call' 2013-10-07t14:15:57.018170+00:00 app[web.2]: e, [2013-10-07t14:15:57.018154 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/request.rb:336:in `parse_multipart' 2013-10-07t14:15:57.019942+00:00 app[web.2]: e, [2013-10-07t14:15:57.019819 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.6.147/lib/new_relic/agent/instrumentation/unicorn_instrumentation.rb:22:in `block (4 levels) in <top (required)>' 2013-10-07t14:15:57.018170+00:00 app[web.2]: e, [2013-10-07t14:15:57.018074 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/multipart/parser.rb:17:in `parse' 2013-10-07t14:15:57.018170+00:00 app[web.2]: e, [2013-10-07t14:15:57.018004 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/multipart/parser.rb:19:in `block in parse' 2013-10-07t14:15:57.018284+00:00 app[web.2]: e, [2013-10-07t14:15:57.018327 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/cache/strategy/local_cache.rb:72:in `call' 2013-10-07t14:15:57.018170+00:00 app[web.2]: e, [2013-10-07t14:15:57.018038 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/multipart/parser.rb:17:in `loop' 2013-10-07t14:15:57.017884+00:00 app[web.2]: e, [2013-10-07t14:15:57.017899 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn/stream_input.rb:51:in `read' 2013-10-07t14:15:57.017884+00:00 app[web.2]: e, [2013-10-07t14:15:57.017867 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/unicorn-4.6.3/lib/unicorn/stream_input.rb:51:in `kgio_read' 2013-10-07t14:15:57.018284+00:00 app[web.2]: e, [2013-10-07t14:15:57.018231 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/methodoverride.rb:26:in `method_override' 2013-10-07t14:15:57.018170+00:00 app[web.2]: e, [2013-10-07t14:15:57.018191 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/request.rb:201:in `post' 2013-10-07t14:15:57.019827+00:00 app[web.2]: e, [2013-10-07t14:15:57.019712 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.6.6.147/lib/new_relic/agent/instrumentation/unicorn_instrumentation.rb:22:in `call' 2013-10-07t14:15:57.017884+00:00 app[web.2]: e, [2013-10-07t14:15:57.017704 #5] error -- : app error: execution expired (timeout::error) 2013-10-07t14:15:57.018170+00:00 app[web.2]: e, [2013-10-07t14:15:57.018114 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/multipart.rb:25:in `parse_multipart' 2013-10-07t14:15:57.018974+00:00 app[web.2]: e, [2013-10-07t14:15:57.018809 #5] error -- : /app/vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:155:in `invalidate' 

heroku has 30 second timeout on request processing through router mesh dyno.

it looks upload large enough needs more time complete, can't run request of size/length through heroku. docs here, explaining policy: https://devcenter.heroku.com/articles/request-timeout

one way work-around limitation create amazon s3 bucket public-write allowed clients can upload directly, js or rich client.

here's separate question explaining how js upload directly s3: uploading image amazon s3 html, javascript & jquery ajax request (no php)