docs: public void open(URL eventStreamURL) throws IOException {
  		log.info("Connecting to event stream |%s|.", eventStreamURL);
  		connection = (HttpURLConnection) eventStreamURL.openConnection();
  		connection.setConnectTimeout(CONNECTION_TIMEOUT);
  		connection.setReadTimeout(READ_TIMEOUT);
  
  		connection.setRequestProperty("Accept", "text/event-stream");
  		connection.setRequestProperty("Connection", "keep-alive");
  		connection.setRequestProperty("Pragma", "no-cache");
  		connection.setRequestProperty("Cache", "no-cache");
  
  		// at this point HTTP URL connection implementation sends request and waits for response
  		// then parses first line and headers and return input stream for body content
  		inputStream = connection.getInputStream();
  	}