# Modified from the original to store the regexp in a constant, to simplify <\/span>\n# the removable of the trailing slash, and to utilize Rack to rebuild the URL.<\/span>\n\nmodule<\/span> Rack<\/span>\n  class<\/span> TrailingSlash<\/span>\n\n    HAS_TRAILING_SLASH<\/span> =<\/span> %r{^/(.*)/$}<\/span>\n\n    def<\/span> initialize<\/span>(<\/span>app<\/span>)<\/span>\n      @app<\/span> =<\/span> app<\/span>\n    end<\/span>\n\n    def<\/span> call<\/span>(<\/span>env<\/span>)<\/span>\n      if<\/span> env<\/span>[<\/span>'PATH_INFO'<\/span>]<\/span> =~<\/span> HAS_TRAILING_SLASH<\/span>\n        env<\/span>[<\/span>'PATH_INFO'<\/span>].<\/span>chomp!<\/span>(<\/span>'/'<\/span>)<\/span>\n        [<\/span>301<\/span>,<\/span> {<\/span>"Location"<\/span> =><\/span> Rack<\/span>::<\/span>Request<\/span>.<\/span>new<\/span>(<\/span>env<\/span>)<\/span>.<\/span>url<\/span>},<\/span> []]<\/span>\n      else<\/span>\n        @app<\/span>.<\/span>call<\/span>(<\/span>env<\/span>)<\/span>\n      end<\/span>\n    end<\/span>\n\n  end<\/span>\nend<\/span>\n\n# NOTE: real-world experience shows this may not work if used behind Varnish, <\/span>\n# because the port will be changed due to the proxy_pass...<\/span>\n<\/pre><\/div>\n