rack/rack — comment on commit b487f02b13f42c5933aa42193ed4e1c0b90382d7
File:  line 0
By kuroda:

This is a temporary measure to provide users a way to suppress annoying warning messages that WEBrick emits:

WARN Could not determine content-length of response body.
Set content-length of the response or set Response#chunked = true

This message is issued when we use WEBrick on Ruby 1.9. You can suppress it if you put `gem "thin"` into your Gemfile.

Note that Mongrel is declared as `deprecated` on its Github page. See https://github.com/evan/mongrel