Method: Down::NetHttp#open

Defined in:
lib/down/net_http.rb

#open(url, *args, **options) ⇒ Object

Starts retrieving the remote file using Net::HTTP and returns an IO-like object which downloads the response body on-demand.



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# File 'lib/down/net_http.rb', line 105

def open(url, *args, **options)
  options = merge_options(@options, *args, **options)

  max_redirects  = options.delete(:max_redirects)
  uri_normalizer = options.delete(:uri_normalizer)

  uri = ensure_uri(normalize_uri(url, uri_normalizer: uri_normalizer))

  # Create a Fiber that halts when response headers are received.
  request = Fiber.new do
    net_http_request(uri, options, follows_remaining: max_redirects) do |response|
      Fiber.yield response
    end
  end

  response = request.resume

  response_error!(response) unless response.is_a?(Net::HTTPSuccess)

  # Build an IO-like object that will retrieve response body on-demand.
  Down::ChunkedIO.new(
    chunks:     enum_for(:stream_body, response),
    size:       response["Content-Length"] && response["Content-Length"].to_i,
    encoding:   response.type_params["charset"],
    rewindable: options.fetch(:rewindable, true),
    on_close:   -> { request.resume }, # close HTTP connnection
    data: {
      status:   response.code.to_i,
      headers:  response.each_header.inject({}) { |headers, (downcased_name, value)|
                  name = downcased_name.split("-").map(&:capitalize).join("-")
                  headers.merge!(name => value)
                },
      response: response,
    },
  )
end