Posting a pdf to Solr using Ajax

I am trying to push (Post) pdf files to Solr/Tika for text extraction and indexing using Ajax/js. I've gotten the following curl command to work:

curl 'http://localhost:8983/solr/techproducts/update/extract?' -F "myfile=@/PathToFile/SomeDoc.pdf"

This command puts the desired pdf into the Solr Index, and I can retrieve it just fine. However, I need to be able to do this from a web browsers. After much googling, and a little experimentation I've got the following js code ALMOST working. It returns a 0 status code, and status of Success, but nothing gets committed to the index:

   $("#solrPost").click(function(event) {

        /* Read a local pdf file as a blob */
        let fileAsBlob = null;
        let file = $('#upload_file')[0].files[0];
        let myReader = new FileReader();

        myReader.onloadend = function() {
            fileAsBlob = myReader.result;
        fileAsBlob = myReader.readAsArrayBuffer(file);

        function sendToSolr(fileAsBlob) {
                type: 'POST',
                data: fileAsBlob,
                cache: false,
                crossOrigin: true,
                dataType: 'jsonp',
                jsonp: 'json.wrf',
                processData: false,
                contentType: false, 

                success: function(data, status) {
                    console.log(" successful, status: " + data.responseHeader.status + "\t status text: " + status);
                error: function(data, status) {
                    console.log(" error, status: " + data.status + "\t status text:" + data.statusText);
                done: function(data, status) {
                    console.log(" Done");

This is SO close to working, but I just can't figure out what's going wrong. All indications (From client side) are good, but nothing added to the index. Note:

  1. The fileReader is working, I see an Array of the same size as the source pdf.
  2. Even though I specify POST, when I examine the network tab in the browser/debugger, it says GET.
  3. I've hardcoded the for simplicity, not a long term strategy...

I know there are similar posts, but none address the issue of extracting pdf's using Solr/Tika outside of the provided post script. Thanks in advance.