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POST is not working with strange error

See original GitHub issue

Hi, I can do a GET request without any problems. The PHP script also works well for POST requests, but when I do a POST request from my ionic app, I always get this error:

{"__zone_symbol__currentTask":{"type":"microTask","state":"notScheduled","source":"Promise.then","zone":"angular","cancelFn":null,"runCount":0},"line":86,"column":22,"sourceURL":"file:///var/containers/Bundle/Application/FAC1A964-4A4A-4081-B9DA-B3D3F1E1BEC1/App.app/www/plugins/cordova-plugin-advanced-http/www/helpers.js"}

I couldn’t find any help so far. Am I doing something wrong? Here is my ionic code:

let postData = new FormData()
  postData.append('s_id',this.s_id)
  postData.append('klasse',this.klasse.id)
  postData.append('stunde',this.stunde.id)
  postData.append('uebungen',JSON.stringify(this.uebungen))
  postData.append('wo_id',woid)

const options = {
    headers: {
        'Content-Type': 'application/x-www-form-urlencoded'
    }
};

this.http.post(
      'URL.php/', 
      postData,
      options
     )
     .then(response => {
        // prints 200
        console.log("Response-Status: "+response.status);
        try {
          response.data = JSON.parse(response.data);
          // prints test
          console.log("Response-Message: "+response.data.message);
        } catch(e) {
          console.error('JSON parsing error');
        }
     })
     .catch(response => {
       // prints 403
       console.log("Response: "+JSON.stringify(response));
      }
     });