class Gzip

  • em_http
    - net_http_persistent on Ruby 2.0+
    - net_http on Ruby 1.9+
    This middleware is NOT necessary when these adapters are used:
    server. This resembles what Ruby 1.9+ does internally in Net::HTTP#get.
    “gzip,deflate” and appropriately handles the compressed response from the
    “Accept-Encoding” header wasn’t set in the request, this sets it to
    Middleware to automatically decompress response bodies. If the

def brotli_inflate(body) 

def brotli_inflate(body)
  self.class.dependency 'brotli'
  Brotli.inflate(body)
end

def call(env) 

def call(env)
  env[:request_headers][ACCEPT_ENCODING] ||= SUPPORTED_ENCODINGS
  @app.call(env).on_complete do |response_env|
    case response_env[:response_headers][CONTENT_ENCODING]
    when 'gzip'
      reset_body(response_env, &method(:uncompress_gzip))
    when 'deflate'
      reset_body(response_env, &method(:inflate))
    when 'br'
      reset_body(response_env, &method(:brotli_inflate))
    end
  end
end

def inflate(body) 

def inflate(body)
  # Inflate as a DEFLATE (RFC 1950+RFC 1951) stream
  Zlib::Inflate.inflate(body)
rescue Zlib::DataError
  # Fall back to inflating as a "raw" deflate stream which
  # Microsoft servers return
  inflate = Zlib::Inflate.new(-Zlib::MAX_WBITS)
  begin
    inflate.inflate(body)
  ensure
    inflate.close
  end
end

def reset_body(env) 

def reset_body(env)
  env[:body] = yield(env[:body])
  env[:response_headers].delete(CONTENT_ENCODING)
  env[:response_headers][CONTENT_LENGTH] = env[:body].length
end

def uncompress_gzip(body) 

def uncompress_gzip(body)
  io = StringIO.new(body)
  gzip_reader = if RUBY_ENCODING
    Zlib::GzipReader.new(io, :encoding => 'ASCII-8BIT')
  else
    Zlib::GzipReader.new(io)
  end
  gzip_reader.read
end