I am trying to encode a PDF that is remotely on a server (not locally neither selecting files using a javascript/HTML "Browse" button) into BASE64.

I already have checked some examples kindly given by others in StackOverflow such as:

Convert PDF to a Base64-encoded string in Javascript

How to convert file to base64 in JavaScript?

But every time I pass the variable where the remote URL for the PDF is, it shows an error saying:

TypeError: Failed to execute 'readAsDataURL' on 'FileReader': parameter 1 is not of type 'Blob'.

function funcTransfPDFParaBase64(strCaminhoPDF) {
var reader = new FileReader();

   reader.readAsDataURL(strCaminhoPDF)
   reader.onload = function () {
     console.log(reader.result);
   };
   reader.onerror = function (error) {
     console.log('Error: ', error);
   };
   
   return reader.result;
}

var objTeste = funcTransfPDFParaBase64(strCaminhoPDF);

URL type used in var strCaminhoPDF: https://somesite/fs/file/Download/FileShare/www/Legislation/2015/DL_2015021028.pdf