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Header streaming response

I want to proxy deleted files through the Sinatra app. This requires streaming an HTTP response with headers from a remote source back to the client, but I cannot figure out how to configure response headers when using the streaming API inside the block provided Net::HTTP#get_response.

For example, this will not set response headers:

get '/file' do
  stream do |out|
    uri = URI("http://manuals.info.apple.com/en/ipad_user_guide.pdf")
    Net::HTTP.get_response(uri) do |file|
      headers 'Content-Type' => file.header['Content-Type']

      file.read_body { |chunk| out << chunk }
    end
  end
end

And this leads to an error Net::HTTPOK#read_body called twice (IOError)::

get '/file' do
  response = nil
  uri = URI("http://manuals.info.apple.com/en/ipad_user_guide.pdf")
  Net::HTTP.get_response(uri) do |file|
    headers 'Content-Type' => file.header['Content-Type']

    response = stream do |out|
      file.read_body { |chunk| out << chunk }
    end
  end
  response
end
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1 answer

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HEAD .

:

get '/file' do
  uri = URI('http://manuals.info.apple.com/en/ipad_user_guide.pdf')

  # get only header data
  head = Net::HTTP.start(uri.host, uri.port) do |http|
    http.head(uri.request_uri)
  end

  # set headers accordingly (all that apply)
  headers 'Content-Type' => head['Content-Type']

  # stream back the contents
  stream do |out|
    Net::HTTP.get_response(uri) do |f| 
      f.read_body { |ch| out << ch }
    end
  end
end

- , , (), , , .

, .

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