I am trying to write a POST request, which works in Postman, as a Playwright test.

During various test runs I have noticed that it does not authenticate my user (no matter if the login is correct or wrong).

I expect a redirect URL, which logs me in on the target page, instead I always get the same default URL back. Furthermore, I only get 2 out of 3 cookies that I receive in Postman.

Does anyone know what the problem is?

import { test, expect, request } from '@playwright/test';
import { json } from 'stream/consumers';

test('IDS POST-Request', async ({}) => {

  // New instance
  const apiRequest = await request.newContext();

  const headers: Headers = new Headers()
  headers.set('Cookie', '##########')  
  headers.set('Content-Type', 'multipart/form-data')  
  headers.set('Host', '')  
  headers.set('Accept', '*/*')
  headers.set('Accept-Encoding', 'gzip, deflate, br')
  headers.set('Connection', 'keep-alive')
  headers.set('Content-Type', 'multipart/form-data; boundary=<calculated when request is sent>')
  
  // xml body payload
  const payloadXml = `<?xml version="1.0" encoding="UTF-8"?>
  #####`;

  const form = new FormData()
  
  form.append("name_kunde","#####")
  form.append("pw_kunde","#####")
  form.append("hookurl","#####")
  form.append("action","#####")
  form.append("warenkorb",payloadXml)
  form.append("version","#####")
  
  const requestOptions: RequestInit = {
    method: 'POST',
    headers: headers,
    body: form,    
    redirect: 'manual'
  };
  
await fetch(`##### URL #####`, requestOptions)

    .then(response => {               

        // Response status
        console.log('Status', response.status)

            const responseHeaders = response.headers    // for each constante
            responseHeaders.forEach((value, key) => {
                console.log(`${key}: ${value}`);
            })         

    })
   
    .catch(error => console.log("error", error));
 
})

I tried to authenticate myself incorrectly, create new users and use a body instead of a form and repeated the process several times in Postman. In Postman the query works and I get the expected results.