Question

我正在尝试使用NodeJs Request模块链接http请求。

示例：

var options = {
  url: 'http://example.com'
};

request.get(options, function(error, response, body){
  var first = JSON.parse(body);

  options.url = 'http://example.com/second' + first.id;

  //nested second request
  request.get(options, function(error, response, body){
    var second = JSON.parse(body);

    options.url = 'http://example.com/third' + second.title;

    //another nested request
    request.get(options, function(error, response, body){
      var third = JSON.parse(body);
      return third;
    });
  })
})

有没有更好的方法来做链接承诺？

Answer 1

请求库does not support promises directly。您可以使用request-promise（或request-promise-native，如果使用ES6）将Promises与request一起使用：

// run `npm install request request-promise` first

var request = require('request-promise');

var options = {
  uri: 'http://example.com',
  json: true // Automatically parses the JSON string in the response
};

request.get(options).then(function(body){
  //second request
  options.url = 'http://example.com/second' + body.id;    
  return request.get(options)
}).then(function(body){
  //third request
  options.url = 'http://example.com/third' + body.title;
  return request.get(options)
}).then(function(body){
  return body;
}).catch(function(error){
  // error handling
});

如何在我的情况下发出http请求？

1 个答案: