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require 'rack/utils'
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']
#see https://stackoverflow.com/questions/26534165/unable-to-get-content-length-header-working-under-rails-4-1puma
#see https://github.com/rails/rails/pull/16793
#&& body.respond_to?(:to_ary)
obody = body
body, length = [], 0
obody.each { |part| body << part; length += bytesize(part) }
obody.close if obody.respond_to?(:close)
headers['Content-Length'] = length.to_s
end
[status, headers, body]
end
end
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