SOAP request in NodeJs returns a 500 Internal Server Error

I'm working on a little project at the moment, where I have to make a SOAP request to a SAP PCo Management Host Service.

I worked on a proof of concept and created a client side javascript document which worked totally fine. So I tried to implement this script in NodeJs on the server side. Therefor I created a web server with node-express and made the request with node-request, but if I send out the request to the PCo Management Host Services is the answer 500 Internal Server Error.

The PCo Management Host displays a raw http request for test purposes, which looks like this:

POST LINKTOHOST HTTP/1.1
User-Agent: PCo
SOAPAction: urn:sap.com:pco.management/PCoManagementService/GetAgentInstancesRuntimeInfo
Authorization: Basic ********
Content-Type: text/xml
Host: HOST
Content-Length: 300
Expect: 100-continue
Accept-Encoding: gzip, deflate

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:urns="urn:sap.com:pco.management"><soap:Body><urns:GetAgentInstancesRuntimeInfo xsi:nil="true" /></soap:Body></soap:Envelope>

I took this raw request and created my own. Here is my working javascript proof on concept:

var userName = prompt("Please Log in with your Windows User Account. Username:","");
var userPW  = prompt("Passwort: ", "");

reqAllAgentRuntimeInfo();
setInterval(function() {reqAllAgentRuntimeInfo()}, 5000);

 /*
 *
 *  Functions
 * 
 */ 

//Sends out the SOAP request via XMLHttpRequest
function reqAllAgentRuntimeInfo()
{
    var xmlhttp = new XMLHttpRequest();
    xmlhttp.open('POST', 'LINKTOHOST', true, userName, userPW);

    var soapRequest =
    '<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:urns="urn:sap.com:pco.management">' +
        '<soap:Body>' +
            '<urns:GetAgentInstancesRuntimeInfo xsi:nil="true" />' +
        '</soap:Body>'+
    '</soap:Envelope>';

    xmlhttp.setRequestHeader('SOAPAction', 'urn:sap.com:pco.management/PCoManagementService/GetAgentInstancesRuntimeInfo');
    xmlhttp.setRequestHeader('Authorization', 'Basic');
    xmlhttp.setRequestHeader('Content-Type', 'text/xml');
    
    xmlhttp.send(soapRequest);

    xmlhttp.onreadystatechange = function()
    {
        //Test for Status Code 4 & 200 = OK
        if(xmlhttp.readyState == 4 && xmlhttp.status == 200)
        {
            displayData(xmlhttp);
        }
    };
}

And then i created this server side NodeJs script, which doesn't work and i can't explain myself why.

const http = require('http'); // 1 - Import Node.js  modules
const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const port = 50001;

app.use(bodyParser.urlencoded({ extended: true}));

app.get('/', (req, res) => 
{
    res.redirect('/logIn');
});

app.get('/logIn', (req, res) => 
{
    res.sendFile(__dirname + '/sites/logIn.html');
});

app.post('/logIn', (req, res) =>
{
    //Encode User Credentials
    var base64url = require('base64url');
    var credentials = 'Basic ' + base64url(req.body.userName + ':' + req.body.password);
    
    var request = require('request');
    let soapReq = 
    '<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:urns="urn:sap.com:pco.management">' +
        '<soap:Body>' +
            '<urns:GetAgentInstancesRuntimeInfo xsi:nil="true" />' +
        '</soap:Body>'+
    '</soap:Envelope>';

    var options = 
    {
        url: 'LINKTOHOST',
        method: 'POST',
        body: soapReq,
        headers:
        {
            'Host': 'HOST',
            'Content-Length':soapReq.length,
            'Accept-Encoding': 'gzip,deflate',
            'User-Agent': 'PCo',
            'SOAPAction': "urn:sap.com:pco.management/PCoManagementService/GetAgentInstancesRuntimeInfo",
            'Authorization': credentials,
            'Content-Type': "text/xml"
        }
    };
    
    let callback = (error, response, body) => 
    {
        if(!error && response.statusCode == 200){
            console.log('PCo Communication raw result', body);
        }
        else
        {
            console.log('PCo Communication Error: ', response.statusCode, response.statusMessage);
        }
    }
    console.log(options);
    request(options, callback);
})

app.listen(port, () =>
{
    console.log(`Webserver listening at http://localhost:${port}`);
}); 

I would be glad if someone could help me.

Thank you.

special thanks to factorypolaris. It works now. Here is my code:

let soapReq = '<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:urns="urn:sap.com:pco.management">' +
        '<soap:Body>' +
            '<urns:GetAgentInstancesRuntimeInfo xsi:nil="true" />' +
        '</soap:Body>'+
    '</soap:Envelope>';

    var options = 
    {
        host: '127.0.0.1',
        auth: req.body.userName + ':' + req.body.password,
        method: 'POST',
        port: 55555,
        path: '/PCoManagement',
        //body: soapReq, -->*Remove this*
        headers:
        {
            'SOAPAction': "urn:sap.com:pco.management/PCoManagementService/GetAgentInstancesRuntimeInfo",
            'Content-Type': "text/xml"
        }
    };
    
    var req = http.request(options, function (response) {
        console.log('STATUS: ' + response.statusCode);
        console.log('HEADERS: ' + JSON.stringify(response.headers));
        response.on('data', function (chunk) {
            console.log('BODY: ' + chunk);
        });
    });
    
    req.write(soapReq); //--> Add this to write your actual data to the message

    req.end();  //--> Add end() to define the end of your request