def request_head(path, initheader = nil, &block)
      request(Head.new(path, initheader), &block)
    end
def request_head(path, initheader = nil, &block)
      request(Head.new(path, initheader), &block)
    end
Sends a HEAD request to the +path+ and returns the response
 as a Net::HTTPResponse object.

 Returns the response.

 This method never raises Net::* exceptions.

     response = http.request_head('/index.html')
     p response['content-type']