code: function (e, req, res, host) {
  		LOG.error('proxy error for host: ' + host + '. remove from active proxy list:', 'SR.Proxy');
  		LOG.error(e, 'SR.Proxy');
  		
  		// remove proxy info from list
  		delete l_proxies[host];
  		
  		// notify for proxy failure
  		UTIL.safeCall(onProxyFail, host);
  		
  		// send back to client about the proxy error
  		res.writeHead(502, {
     			'Content-Type': 'text/plain'
  		});
  		res.end('PROXY_ERROR: cannot access proxy: ' + host);		
  	}
docs: same error handling for both HTTP or WebSocket proxies