Method: HTTPClient.head

Defined in:

lib/rwd/net.rb

.head(uri, form = {}, recursive = true) ⇒ Object

# File 'lib/rwd/net.rb', line 330

def self.head(uri, form={}, recursive=true)
  header  = Header.new(nil)

  begin
    while not uri.nil?
      uri   = EVURI.new(uri) if uri.kind_of? String
      host    = uri.host
      port    = uri.port

      if $proxy.nil? or $proxy.empty? or host == "localhost"
        io    = nil

        @@mutex.synchronize do
          io      = TCPSocket.new(getaddress(host), port.zero? ? 80 : port)
        end

        io.write("HEAD #{uri.path or '/'}#{uri.varstring.empty? ? '' : '?' + uri.varstring} HTTP/1.0\r\nHost: #{host}\r\n\r\n")
      else
        proxy   = EVURI.new($proxy)
        io    = TCPSocket.new(proxy.host, proxy.port.zero? ? 8080 : proxy.port)

        io.write("HEAD #{uri} HTTP/1.0\r\n#{"Proxy-Authorization: Basic "+$proxy_auth+"\r\n" if not $proxy_auth.nil?}\r\n\r\n")
      end

      io.close_write

      res = io.read

      io.close_read

      header, data  = nil, nil
      header, data  = res.split(/\r*\n\r*\n/, 2) if not res.nil?
      header    = Header.new(header)

      if recursive and header.header["location"] != uri.to_s
        uri = EVURI.new(uri) + header.header["location"]
      else
        uri = nil
      end
    end
  rescue Errno::ECONNRESET, Errno::EHOSTUNREACH => e
    $stderr.puts e.message
    sleep 1
    retry
  rescue Errno::ECONNREFUSED => e
    data  = nil
  rescue NoAddressException => e
    $stderr.puts e.message
    header  = Header.new(nil)
  end

  GC.start

  return header
end