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Problem with Ajax post

Last Modified: 2020-02-24
I have a HTML5/js web page that was working fine and stopped working a short time ago.  I have placed this web page temporally at: https://www.barnwellmd.com/temp/test.html so I can delete it after I close this question (it saves files on my server and sends me an email).  

The problem is when a user clicks on "Send to Dr. Office" a popup shows "<head><title>Not Acceptable!</title></head><body><h1>Not Acceptable!</h1><p>An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security.</p></body></html>" and nothing is sent.

That button calls the sendCanvas() function:
function sendCanvas()
      if (checkFields()) return;
      var testCanvas = document.getElementById("imageView");  
      var canvasData = testCanvas.toDataURL("image/png");
      var ajax = new XMLHttpRequest();
      //alert ('https://www.barnwellmd.com/Uploadroutines/uploadbase64.php?name=' + document.form.ptname.value.replace(/ /g,"_"));
      ajax.open("POST",'https://www.barnwellmd.com/Uploadroutines/uploadbase64.php?name=' + document.form.ptname.value.replace(/ /g,"_"),false);
      ajax.setRequestHeader('Content-Type', 'canvas/upload');
      //ajax.setRequestHeader('Content-Type', 'application/upload');
            if (ajax.readyState == 4)
                  // Write out the filename.
                  //document.getElementById("debugFilenameConsole").innerHTML="Saved as<br><a target='_blank' href='"+ajax.responseText+"'>"+ajax.responseText+"</a><br>Reload this page to generate new image or click the filename to open the image file.";

Any help would be appreciated.

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