gistfile1.txt

return when(this.httpClient.request(opts), function success(resp) { 
      var body = "";
      return when(resp.body.forEach(function(chunk) { body += chunk; }), function() { 
        var val = JSON.parse(body);
        
        if (resp.status >= 400) {
          try {
            val = JSON.parse(body);
          } catch (err) {
            val = { error: 'ParseError', reason: body }
          }
          finally {
            throw val;
          }
        }
        
        return val;
      });
    });