HTTPS POST requests not working in release build

Ionic Framework ionic-v3
3

I had to use cordova-plugin-advanced-http and change my code so I could do this.http.setSSLCertMode('nocheck'); until I can get the final certificate so I can do SSL Pinning.
This is how I changed my code.

Angular HTTP:

postData(data, object, type) {
   return new Promise((resolve, reject) => {
     var headers = new Headers();
     headers.append('Access-Control-Allow-Origin' , '*');
     headers.append('Access-Control-Allow-Methods', 'POST, GET, OPTIONS, PUT');
     headers.append('Accept','application/json');
     headers.append('content-type','application/json');
     let options = new RequestOptions({headers:headers});

     this.http.post(url, data, options)
       .subscribe(res => {
         resolve(res.json());
       }, (err) => {
         reject(err);
       });
   });
 }

to

Cordova/Ionic Native HTTP:

postData(data, object, type) {
  return new Promise((resolve, reject) => {
    //Don't check SSL Certificate
    this.http.setSSLCertMode('nocheck');
    this.http.setHeader('*', 'Access-Control-Allow-Origin' , '*');
    this.http.setHeader('*', 'Access-Control-Allow-Methods', 'POST, GET, OPTIONS, PUT');
    this.http.setHeader('*', 'Accept','application/json');
    this.http.setHeader('*', 'content-type','application/json');
    //Important to set the data serializer or the request gets rejected
    this.http.setDataSerializer('json');
    this.http.post(url, data, {}).then(res =>{
      resolve(JSON.parse(res.data));
    })
    .catch(err =>{
      reject(err);
    });
  });
}

This allowed the HTTPS POST requests to work in the release build

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