An asynchronous file download HttpServer instance implemented by ruby,

An asynchronous file download HttpServer instance implemented by ruby,

1. Use ruby eventmachine and em-http-server gem to complete a simple HttpServer that provides the file download function.

2. The FileStreamer of EM is used to send files asynchronously. When the file is sent, the header is assembled and FileStreamer is called.

require 'rubygems'require 'eventmachine'require 'em-http-server'class HTTPHandler < EM::HttpServer::Server attr_accessor :filename, :filesize, :path def process_http_request #send file async if @http_request_method.to_s =~ /GET/ && @http_request_uri.to_s.end_with?(filename)  send_data "HTTP/1.1 200 OK\n"  send_data "Server: XiaoMi\n"  send_data "Connection: Keep-Alive\n"  send_data "Keep-Alive: timeout=15\n"  send_data "Content-Type: application/octet-stream\n"  send_data "Content-Disposition: filename='#{filename}'\n"  send_data "Content-Length: #{filesize}\n"  send_data "\n"  streamer = EventMachine::FileStreamer.new(self, path)  streamer.callback {  # file was sent successfully  close_connection_after_writing  } else  response = EM::DelegatedHttpResponse.new(self)  response.status = 200  response.content_type 'text/html'  response.content = "Package HttpServer<br>usage: wget http://host:port/#{filename}"  response.send_response end endendEM::run do path = '/tmp/aaa.tar.gz' EM::start_server("0.0.0.0", 8080, HTTPHandler) do |conn| conn.filename = File.basename(path) conn.filesize = File.size(path) conn.path = path endend