require 'rack/utils'
require 'rack/body_proxy'
module Rack
# Sets the Content-Length header on responses with fixed-length bodies.
class ContentLength
include Rack::Utils
def initialize(app)
@app = app
end
def call(env)
status, headers, body = @app.call(env)
headers = HeaderHash.new(headers)
if !STATUS_WITH_NO_ENTITY_BODY.include?(status.to_i) &&
!headers[CONTENT_LENGTH] &&
!headers['Transfer-Encoding'] &&
body.respond_to?(:to_ary)
obody = body
body, length = [], 0
obody.each { |part| body << part; length += bytesize(part) }
body = BodyProxy.new(body) do
obody.close if obody.respond_to?(:close)
end
headers[CONTENT_LENGTH] = length.to_s
end
[status, headers, body]
end
end
end
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