# class Rack::ContentLength

Sets the Content-Length header on responses that do not specify a Content-Length or Transfer-Encoding header. Note that this does not fix responses that have an invalid Content-Length header specified.

### Public Class Methods

new(app) click to toggle source

    # File lib/rack/content_length.rb, line 12
    def initialize(app)
      @app = app
    end

### Public Instance Methods

call(env) click to toggle source

    # File lib/rack/content_length.rb, line 16
    def call(env)
      status, headers, body = @app.call(env)
      headers = HeaderHash[headers]

      if !STATUS_WITH_NO_ENTITY_BODY.key?(status.to_i) &&
         !headers[CONTENT_LENGTH] &&
         !headers[TRANSFER_ENCODING]

        obody = body
        body, length = [], 0
        obody.each { |part| body << part; length += part.bytesize }

        body = BodyProxy.new(body) do
          obody.close if obody.respond_to?(:close)
        end

        headers[CONTENT_LENGTH] = length.to_s
      end

      [status, headers, body]
    end