Download file with xhr2 [blob url & html5 file api]

readme.md

Important.

• cors must be enabled.

Read.

• http://www.html5rocks.com/en/tutorials/file/filesystem/#toc-support
• http://www.html5rocks.com/en/tutorials/file/xhr2/
• http://www.w3.org/TR/FileAPI/#dfn-SecurityError

blob.js

var url = 'http://backend.siplik.co/public/word-to-pdf.pdf';

var xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.responseType = 'blob';

xhr.onprogress = function(pe) {
  console.log('progress');
  if (pe.lengthComputable) {
    console.log((pe.loaded / pe.total) * 100);
  }	
};

xhr.onload = function(e) {
  if (this.status == 200) {
    window.open(href=window.URL.createObjectURL(
      new Blob([this.response], {type: 'application/pdf'})
    ));              
  }
};

xhr.send();

blob_storage.js

var url = 'http://backend.siplik.co/public/word-to-pdf.pdf';

window.requestFileSystem  = window.requestFileSystem || window.webkitRequestFileSystem;

var xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.responseType = 'blob';

xhr.onprogress = function(pe) {
  console.log('progress');
  if (pe.lengthComputable) {
    console.log((pe.loaded / pe.total) * 100);
  }	
};

xhr.onload = function(e) {
  if (this.status == 200) {
    window.requestFileSystem(window.TEMPORARY, 1024 * 1024, function (fs) {
      fs.root.getFile('q.pdf', { create: true }, function (fileEntry) {
        fileEntry.createWriter(function (writer) {		      		
          writer.onwriteend = function (e) {
            window.open(fileEntry.toURL());		      			
            console.log('archivo escrito');
          }
          writer.onwrite = function(e) { console.log(e); };
          writer.onerror = function(e) { console.log(e); };
          
          var blob = new Blob([xhr.response], {type: 'application/pdf'});
          writer.write(blob);
        }, function (e) {
          console.log('cw');
          console.log(e);
        });
      }, function (e) {
        console.log('fs');
        console.log(e);
      });
    }, function (e) {
      console.log('rfs');
      console.log(e);
    });
  }
};


xhr.send();

Hi,
I'm executing both codes (blob and blob_storage) on android, but:
blob shows a blank page
blob_storage print "archivo escrito", but the file is not created.

Can you give me suggestions?

Thanks