javascript - 修改中间件-Node.JS中的请求对象

Question

我的 Node.JS 应用程序中有一堆中间件，有什么方法可以删除/修改 req.path 并反射(reflect)在下一个中间件中？

如果我的问题含糊不清，如果您需要更多说明，请告诉我？

更新:

即使 req.path = 'foo' 也不会更改该行之后的我的 req.path!

req.path = "foo";
console.log(req.path);// Here still it shows my original req.path not foo!

谢谢

Answer 1

function requestDispatcher() {
  //default version was set to v1
  var defaultVersion = 'v1',
    re = /\/v\d/;
  return function(request, response, next) {
    var version = request.get('version');
    debug(request.url);
    // test if request.url has already contained version number
    if (!re.test(request.url)) {
      // if not define version number in http header then set default version
      // otherwise use the version number in the http header
      if (version === null || version === undefined) {
        request.url = ['/', defaultVersion, request.url].join('');
      } else {
        request.url = ['/', version, request.url].join('');
      }
    }
    debug(request.url);
    next();
  };
}

我使用这个技巧将请求分派(dispatch)到指定版本，如果未指定，则路由到默认版本。这对我有用

app.use(requestDispatcher());
app.use('/v1', require('./v1'));
app.use('/v2', require('./v2'));