如何发送 POST 请求以响应 node.js Express？

Question

I followed this video to get rid of cors issue. It worked fine for GET request.But when I'm trying to send a POST request it is not working. I don't have control at 3rd_Party_Api, so can't change anything of it. My calls are as follows : req-request and res-response.

ReactApp(3000) --req--> Express(8080) --req--> 3rd_Party_API(9091)

ReactApp <--res-- Express <--res-- 3rd_Party_API

I'm not sure where I'm going wrong. I'm posting my files here. PostApp.js

import React, { Component } from 'react';
//import ReactDOM from 'react-dom';
import './App.css';
import axios from 'axios';

class App extends Component {

    constructor(props) {
        super(props);
        this.state = {
          varName: '',
          submit: ''
        }
        this.handleChange = this.handleChange.bind(this)
        this.handleSubmit = this.handleSubmit.bind(this)
    }
    handleChange(event) {
        this.setState({
          varName: event.target.value
        });
    }
    handleSubmit(event){
        event.preventDefault()
        const base_url="http://127.0.0.1:8080/api/addvar"
        const data={varName:this.state.varName}
        axios.post(base_url,data)
        .then(response =>{
            console.log(response)
        })
        .catch(error =>{
            console.log(error.response)
        })
        console.log(JSON.stringify(data))

        this.setState({
            submit: this.state.varName
        })
    }

  render(){
      return(
          <div className="App">
            <form onSubmit={this.handleSubmit}>
                <label>varName: </label>
                <input type="text"  value={this.state.varName} onChange={this.handleChange} />
                <br/><br/><input type="submit" value="Add Name"/> 
            </form>
            <h1>{this.state.submit}</h1>
          </div>
      )
  }
}
export default App;

Server.js

var request = require('request-promise');
var cors = require('cors');
var express = require('express');
var url = require('url');
var bodyParser = require('body-parser');

var app = express();
var server = app.listen('8080',function(){console.log('listening to port 8080');});

app.use(bodyParser.json()); 
app.use(cors());
//app.get('/api/getNames',runThisCode);
console.log('got1');
app.get('/api/addName',plusname);
console.log('got3');

function plusname(req,res){
    var input = req.body;
    console.log('urlbody:' ,input);
    var options = {
        method: 'POST',
        url: 'http://localhost:9091/v1/names/',
        body: req.body,
        header:{
            'content-type' : 'application/json'
        },
        resolveWithFullResponse: true,
        json: true

    };
    request(options)
    .then((r1) =>{
        res.send(JSON.parse(r1.body));
    })
    .catch(err =>{
        console.log(err.response);
    })

}

Answer 1

Your server is using app.get . To handle a post request you need to change it to app.post or app.all

https://expressjs.com/en/guide/routing.html