Content-Length: handle body w/ UTF8 characters for Ruby 1.9+ to avoid Rack::Lint::LintError

[erikj]

Thanks to cloudhead/toto#93, I have uncovered why our Rails application that uses stopwatch was producing Rack::Lint::LintErrors, e.g.:

ERROR -- : app error: Content-Length header was 48738, but should be 48748 (Rack::Lint::LintError)

This is a result of how Ruby handles lengths of UTF8 strings differently between 1.8 and 1.9.

This pull request uses String#bytesize() if body responds to it, otherwise falls back to String#length and eliminates these Rack::Lint::LintErrors in our Rails app.

The stopwatch gem is very useful for Rails application development, and we have been using it for many years, thank you!

[bittersweet]

Hey @erikj , thanks a lot for the pull request :-) I had no idea this was happening! Awesome stuff.

I'll pull in this change and freshen up the codebase for a bit, I'll report back when there's a new version available :-)

[bittersweet]

I just released version v1.0.0, I thought it was time :-) Not much has changed or will change.

I also added a spec for this fix in 71c6695.

Thanks again!

[erikj]

Cool, thanks @bittersweet ! Woo hoo, v1.0.0! :)