Puppet

Several passenger users reported that some version (including 2.2.15) were crashing while serving streamed files in 2.6 with the following stack trace:

[Thu Jul 29 18:03:00 2010] [error] [client 136.168.1.4] Premature end of script headers: preamble
[ pid=28460 file=ext/apache2/Hooks.cpp:735 time=2010-07-29 18:03:00.77 ]:
The backend application (process 30417) didn't send a valid HTTP response. It might have crashed during the middle of sending an HTTP response, so please check whether there are crashing problems in your application. This is the data that it sent: [Content-Type]
*** Exception NoMethodError in PhusionPassenger::Rack::ApplicationSpawner (undefined method `each' for 3238:Fixnum) (process 30417):
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/rack/request_handler.rb:100:in `process_request'
    from /usr/local/lib/ruby/gems/1.8/gems/rack-1.1.0/lib/rack/utils.rb:278:in `each'
    from /usr/local/lib/ruby/gems/1.8/gems/rack-1.1.0/lib/rack/utils.rb:277:in `each'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/abstract_request_handler.rb:207:in `main_loop'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/rack/application_spawner.rb:120:in `run'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/rack/application_spawner.rb:65:in `spawn_application'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/utils.rb:252:in `safe_fork'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/rack/application_spawner.rb:58:in `spawn_application'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/rack/application_spawner.rb:41:in `spawn_application'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/spawn_manager.rb:150:in `spawn_application'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/spawn_manager.rb:278:in `handle_spawn_application'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/abstract_server.rb:352:in `__send__'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/abstract_server.rb:352:in `main_loop'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/lib/phusion_passenger/abstract_server.rb:196:in `start_synchronously'
    from /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/bin/passenger-spawn-server:61

The issue is that passenger needs http header values to be strings, but we send the Content-Length as an int.