发送 JSON 到不同的地址然后 res

Question

我创建了一个小型 express 模块。 此 atm 监听 url 以在 localhost 上运行，但计划监听 triggerURL:ListenPort 并从外部服务运行。

clientA：服务器应接收来自网页 (triggerURL) 的调用，并作为响应将 JSON 对象发送到 unity_url。

clientB：Unity 应用将打开并监听SendingPort。

问题是，虽然我将 JSON 发送到 res 并返回到 clientA 没有问题，但我不确定如何使用 resp 和 writable 创建新的可写流并将 json 发送到 clientB。

var express = require('express');
var fs = require('fs');
var app = express();

var triggerURL = ''; //i'll send an http request to this adress to trigger the action from server


var JSON = {
    item: "seeds",
    Answers: "5",
    richText: "<b>How can you reduce crop toxicity by turning plants upside down?</b><br/>Idea:<br/> Upside-down gardening is a hanging vegetable garden being the suspension of soil and seedlings of a kitchen garden to stop <b>pests</b> and blight,and eliminate the typical gardening tasks of tilling, weeding, and staking plants."
}
var port = process.env.PORT || 3000;
var ListenPort = '8086'; // my port to recieve triggers
var SendingPort = '4046'; // which unity will listen to
var unity_url ='185.158.123.54:'+SendingPort; //fake IP, just for the example

//triggerURL
app.get('/', function(req,res){
    var resp = JSON.stringify(JSON);
    var writable = fs.createWriteStream();

    //res.json(JSON); //instead i wanna send it to unity_url;
});


//app.listen(ListenPort);
app.listen(port);

Answer 1

您需要向目标网址发送请求。例如（使用node-fetch）。

const fetch = require('node-fetch');
const express = require('express');
const app = express();

var JSON = {
    item: "seeds",
    Answers: "5",
    richText: "<b>How can you reduce crop toxicity by turning plants upside down?</b><br/>Idea:<br/> Upside-down gardening is a hanging vegetable garden being the suspension of soil and seedlings of a kitchen garden to stop <b>pests</b> and blight,and eliminate the typical gardening tasks of tilling, weeding, and staking plants."
}

const port = process.env.PORT || 3000;
const unity_url ='185.158.123.54:4046'; //fake IP, just for the example

//triggerURL
app.get('/', function(req,res){
    var resp = JSON.stringify(JSON);

    fetch(unity_url, {
        method: 'post',
        body:    resp,
        headers: { 'Content-Type': 'application/json' },
    })
    .then(res => res.json())
    .then(data => console.log(data));

    res.status(200).send('OK');
});

app.listen(port);