Hello, I've started to look into Rack (and its tests) on Windows just to ensure things are running as much properly as possible. I found a few hardcoded values to temporary files (/tmp/rack_sendfile) that is blocking spec_sendfile.rb from executing. Perhaps it will be good to use the system temporary directory instead? Beyond that, and without installing any particular handlers, rack tests results in: ruby 1.9.3p327 (2012-11-10) [i386-mingw32] 583 tests, 1761 assertions, 4 failures, 2 errors ruby 2.0.0dev (2012-11-10 trunk 37612) [i386-mingw32] 583 tests, 1761 assertions, 5 failures, 2 errors ruby 2.0.0dev (2012-11-10 trunk 37612) [x64-mingw32] 583 tests, 1761 assertions, 5 failures, 2 errors See gist for full details: https://gist.github.com/4054864 Do you think tests are incorrectly assuming details of the platform (test is not prepared to run on Windows) or do you think the failures are possible rack issues with Windows? How would you like to proceed? I wanted to get the conversation going before invest more time on this. Thank you. -- Luis Lavena