如何在Node中的另一个端点上发出GET请求？

Question

I'd like to set up a Node server where inside one endpoint, a GET request can be made to another endpoint in the same server.

My code for testing this is as follows:

const express = require('express');
const app=express();
const https=require("https");

const port=1337;
app.listen(port,()=>{
    console.log('live on port '+port);
});



app.get('/',function(req,res){
    res.send('Homepage here');
    var url="localhost/test?param=abcde";
    https.get(url,res=>{
      body=JSON.stringify(res);
      console.log(body);
    });
});


app.get('/test',(req,res)=>{
    var response=req.param;
    console.log(response);
    res.send(response);
});

When the user goes to the main page, it should send a GET request to /test that returns the value specified by param . However, when I open the page, I get this error at the console:

Error: Unable to determine the domain name

This also happens if I set

var url="./test?param=abcde";

or

var url="/test?param=abcde";

What is the correct URL to use for accessing another endpoint in the same .js server file? And is this the correct way to pass a GET parameter into that endpoint and return a result to the calling endpoint?

Note: it is a similar problem to this question , but that one doesn't seem to have a workable solution posted, unless there's something useful in this response that I'm overlooking.

Answer 1

I have three concerns.

First, port seems 1337, so shouldn't you request var url="localhost:1337/test?param=abcde"; instead of var url="localhost/test?param=abcde";

Second, do you use https or http ? If http, use http module instead of https .

Third, it's GET request and ?param=abcde is a query parameter, so change to var response=req.query; instead of var response=req.param; http://expressjs.com/ja/api.html#req.query

I modified the code(in my local environment, this works). I use http module because in my local environment https is not supported. But if you use twilio, you may use https

const express = require('express');
const app=express();
const http=require("http");

const port=8080;
app.listen(port,()=>{
    console.log('live on port '+port);
});



app.get('/',function(req,res){
    res.send('Homepage here');
    var url="http://localhost:8080/test?param=abcde";
    var req = http.request(url,res=>{
      // comment out, because in my environment this causes error
      // body=JSON.stringify(res);
      // console.log(body);
      res.on('data', (chunk) => {
        console.log(`BODY: ${chunk}`);
      });
    });
    req.end();
});


app.get('/test',(req,res)=>{
    console.log('route /test')
    var response=req.query;
    console.log(response);
    res.send(response);
});

Output:

live on port 8080
route /test
{ param: 'abcde' }
BODY: {"param":"abcde"}

Answer 2

You should use http or https in first address

var url="http://localhost/test?param=abcde"
// Or
var url="https://localhost/test?param=abcde"