What are the methods for Node.js to simulate http requests? (Method summary)

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It is very common to use Node.js to simulate initiating http requests. However, since the methods provided by the Node module (native and third-party libraries) are all asynchronous, it is very troublesome to apply in many scenarios. It is better to synchronize Comes conveniently. The following summarizes several methods for converting several common library APIs from asynchronous to synchronous. The modules are: request, request-promise, request-promise-native, request-promise-any

PS: Node version>=8.0.0 In order to use Async/Await
PS: Add auth here The field is for requests from applications that require username and password to log in, such as rabbitmq. This parameter can be removed for pages that do not require login.

The first one

Use the native module util and use its promisify API. The code example is as follows:

const request = require('request');
const util = require('util');
var url = "https://www.baidu.com/";
const getPromise = util.promisify(request.get);
// PS: 这里加入auth 字段是为了需要用户名和密码登录的应用的请求 ，比如rabbitmq ,不需要登录的页面可以去掉这个参数。

//1：  原生写法  无auth 参数
getPromise(url).then((value)=>{
    console.log("value" , value );
}).catch((err)=>{
    console.log("err" , err );
});

//2：  原生写法  有auth 参数
getPromise(url , {'auth' : {
    'user' : 'xx',
    'pass' : 'xx',
    'sendImmediately' : 'false',
}}).then((value)=>{
    console.log("value" , value );
}).catch((err)=>{
    console.log("err" , err );
});

// 第二种写法   async/await

// 个人最建议使用这种 ， 只使用util 和 request 。

async function handle(){

    let result = await getPromise(url , {'auth' : {
        'user' : 'xx',
        'pass' : 'xx',
        'sendImmediately' : 'false',
    }});
    // 可以加入 try catch 捕获异常  也可以加 .catch()
    console.log("result" , result.);
}

handle();

PS: `auth` 参数的用法参考[链接][1]  , 在异步变同步中 不能使用  `request.get().auth()` 写法。

The second one

Use the module request-promise -native, request-promise-native is written using native Promise. Looking at the source code, you can see that it is inherited from the Request module. The code example is as follows:

// 不再写 原生示例  then()链的那种，参考第一个示例即可
//get 请求示例   
const rpn = require('request-promise-native');  
var url = "https://www.baidu.com/";
async function useRequestPromiseNative(){
    // options 里面的参数可以去看request的源码  查看其index.d.ts 文件里面的 interface CoreOptions 里面有所有的参数。
    let options = {
        method: 'GET',
        uri: url,
        auth : {
            'user' : 'xx',
            'pass' : 'xx',
            'sendImmediately' : 'false',
        }
      };
    let  rpnbody = await rpn(options);       
    
    console.log("rpnbody" , rpnbody );
}

useRequestPromiseNative();

// post 示例 
const rpn = require('request-promise-native');
var url = "https://www.baidu.com/";
async function useRequestPromiseNative(){
    let options = {
        method: 'POST',
        uri: url,
        body: {    // 这里定义你的body参数
        }
        json: true, // 这个看你的参数而定
      };
    let  rpnbody = await rpn(options);       
    
    console.log("rpnbody" , rpnbody );
}
useRequestPromiseNative();

The third one

uses the module request-promise , request-promise is written based on bluebird. If you look at the source code, you can see that it is inherited from the Request module. The code example is as follows:

// 不再写post 示例

const rp  = require('request-promise');
var url = "https://www.baidu.com/";
async function useRequestPromise(){
    let options = {
        method: 'GET',
        uri: url,
        auth : {      //可以拿掉
            'user' : 'xx',
            'pass' : 'xx',
            'sendImmediately' : 'false',
        }
      };
    let  rpbody = await rp(options);       
    console.log("rpnbody" , rpbody );
}

useRequestPromise();

The fourth one

Use the module request-promise-any, request- promise-any is also written based on request. The code example is as follows:

// 不再写post 示例

const rpa = require('request-promise-any');
var url = "https://www.baidu.com/";
async function useRequestPromiseAny(){
    let options = {
        method: 'GET',
        uri: url,
        auth : {
            'user' : 'xx',
            'pass' : 'xx',
            'sendImmediately' : 'false',
        }
      };
    let  rpabody = await rpa(options);       
    console.log("rpabody" , rpabody );
}

useRequestPromiseAny();

The fifth type

uses the module bluebird and uses its promisifyAll API to convert it into Promise. The code example is as follows:

const Promise = require('bluebird');
const request = require('request');
var url = "https://www.baidu.com/";
Promise.promisifyAll(request, { suffix: 'SC' });  //suffix 自定义 get --> getSC

async function usebluebird(){

    let result = await request.getSC(url , {'auth' : {
        'user' : 'xx',
        'pass' : 'xxx',
        'sendImmediately' : 'false',
    }});
    console.log("result" , result);
}

usebluebird()

The above summarizes 5 ways to use it. In fact, there are more than 5 ways. You can choose according to your needs.

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