Rack assumes multipart/form-data preamble is blank

[rack]

Rack assumes multipart/form-data preamble is blank

[tenderlove]

Just to be specific, the part of RFC1521 paragraph 7.2.1 that applies is this:

There appears to be room for additional information prior to the
first encapsulation boundary and following the final boundary. These
areas should generally be left blank, and implementations must ignore
anything that appears before the first boundary or after the last
one.

Here is a patch with a test and fix.

[tenderlove]

read from the input until we find the boundary. closed by a5dae21

[sarmiena]

Was this ever released in core? Just came across this exception:

Error during failsafe response: ActionView::Template::Error
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/activesupport-3.0.7/lib/active_support/whiny_nil.rb:48:in method_missing' /home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/actionpack-3.0.7/lib/action_dispatch/http/parameters.rb:10:inparameters'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/actionpack-3.0.7/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb:3:in __home_aldo__rvm_gems_ruby_______p__rails__gems_actionpack_______lib_action_dispatch_middleware_templates_rescues_diagnostics_erb___564800590_97272930_941118300' /home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/actionpack-3.0.7/lib/action_view/template.rb:135:inblock in render'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/activesupport-3.0.7/lib/active_support/notifications.rb:54:in instrument' /home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/actionpack-3.0.7/lib/action_view/template.rb:127:inrender'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/actionpack-3.0.7/lib/action_view/render/rendering.rb:59:in block in _render_template' /home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/activesupport-3.0.7/lib/active_support/notifications.rb:52:inblock in instrument'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/activesupport-3.0.7/lib/active_support/notifications/instrumenter.rb:21:in instrument' /home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/activesupport-3.0.7/lib/active_support/notifications.rb:52:ininstrument'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/actionpack-3.0.7/lib/action_view/render/rendering.rb:56:in _render_template' /home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/actionpack-3.0.7/lib/action_view/render/rendering.rb:26:inrender'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/actionpack-3.0.7/lib/action_dispatch/middleware/show_exceptions.rb:88:in rescue_action_locally' /home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/actionpack-3.0.7/lib/action_dispatch/middleware/show_exceptions.rb:68:inrender_exception'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/actionpack-3.0.7/lib/action_dispatch/middleware/show_exceptions.rb:59:in call' /home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/railties-3.0.7/lib/rails/rack/logger.rb:13:incall'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/rack-1.2.2/lib/rack/runtime.rb:17:in call' /home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/activesupport-3.0.7/lib/active_support/cache/strategy/local_cache.rb:72:incall'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/rack-1.2.2/lib/rack/lock.rb:11:in block in call' <internal:prelude>:10:insynchronize'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/rack-1.2.2/lib/rack/lock.rb:11:in call' /home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/actionpack-3.0.7/lib/action_dispatch/middleware/static.rb:30:incall'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/railties-3.0.7/lib/rails/application.rb:168:in call' /home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/railties-3.0.7/lib/rails/application.rb:77:inmethod_missing'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/railties-3.0.7/lib/rails/rack/log_tailer.rb:14:in call' /home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/rack-1.2.2/lib/rack/content_length.rb:13:incall'
/home/aldo/.rvm/gems/ruby-1.9.2-p0@rails3/gems/rack-1.2.2/lib/rack/handler/webrick.rb:52:in service' /home/aldo/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/webrick/httpserver.rb:111:inservice'
/home/aldo/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/webrick/httpserver.rb:70:in run' /home/aldo/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/webrick/server.rb:183:inblock in start_thread'

Started POST "/documents.js" for 70.181.90.212 at 2011-04-29 01:40:39 -0500

EOFError (bad content body)