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How do I send user to a link upon successful xhr POST?

I have a working web page, complete with a JavaScript function that displays text messages based on the "non-successful" results, within the same page. Everything is working except this last step.
I need to send a JSON string to my server in a POST, and regardless of outcome, I need the user's browser to navigate to the page returned in the POST. (Just as if it were an ordinary link ( href ="" type of thing.) I am using the custom tag [OK_RESULT_URL] that my server replaces with the real URL just before the page is downloaded.
You see in my code below, that I set the URL to [OK_RESULT_URL] AND the window.location to [OK_RESULT_URL] as well, which seems wrong. That means I'm making two hits to [OK_RESULT_URL], one is a POST with a body (which is correct) and the other one a GET without a body (which is wrong).
I'm a total newbie to JavaScript, so I'm probably missing something obvious. It's as if instead of using xhr.Send() I want to say xhr.SendAndNaviateTo() ... or something like that.
Thanks for any help you can provide.
onApproval: function (response) {
showResult("Approved", JSON.stringify(response, null, ''\t''));
let xhr = new XMLHttpRequest();
let url = "[OK_RESULT_URL]";
xhr.open("POST", url, true);
xhr.setRequestHeader("Content-Type", "application/json");
xhr.onreadystatechange = function () {if (xhr.readyState === 4 && xhr.status === 200){
window.location = "[OK_RESULT_URL]"};
var data = JSON.stringify(response);
xhr.send(data);
}

POST data with ajax

I'm trying to save a few lines of text in a textarea with ajax targeting a classic asp file.
I'm not sure how to use ajax when when it comes to sending data with POST method and NOT using jQuery, didn't find any questions concerning this here either, no duplicate intended.
Ajax function:
function saveDoc() {//disabled
var xhttp = new XMLHttpRequest();
var note = document.getElementById("note");
xhttp.onreadystatechange = function() {
if (xhttp.readyState == 4 && xhttp.status == 200) {
document.getElementById("0").innerHTML = xhttp.responseText;
}
};
xhttp.open("POST", "saveNote.asp", true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.send(note);
ASP Classic:
set fs=Server.CreateObject("Scripting.FileSystemObject")
set f=fs.OpenTextFile("c:\inetasp\1.txt",8,true)
dim note
note = RequestForm("note")
f.Write(note)
f.Close
Response.Write("Works.");
set f=nothing
set fs=nothing
I'm aware there might be a lot wrong with the .asp since i couldn't find any specific info about how to handle ajax requests with Classic ASP correctly.
Any suggestions on how to make this work without jQuery are welcome.

I cannot test your code as I don't have a backend running on my machine right now. But I can already tell you a few things:
you are calling xhttp.send(note); but your note is a DOM element. It should be a string with a querystring format.
in your server side code you call RequestForm is it a custom function you have previously defined ? The usual syntax is Request.Form
Hope it can help

Define Javascript Variable With Contents of URL

I have found a geocoder website that will give me some data that I need as a variable in my javascript code: http://geocoder.us/service/csv/geocode?zip=95472. the website returns only the content: 38.393314, -122.83666, Sebastopol, CA, 95472. I need pull this information from the website and put it into a string.
abc = "38.393314, -122.83666, Sebastopol, CA, 95472"
How can I accomplish this?

You can use AJAX:
var req = new XMLHttpRequest(); //Create an AJAX object
req.open('GET','http://geocoder.us/service/csv/geocode?zip=95472',true); //Location and method
req.send(); //Send
req.onreadystatechange = function() { //When it's ready
if (this.readyState === 4) { //... which is code 4
console.log(this.responseText); //Then you have the responseText
}
}
This only works when the request is from the same domain, tho (for security purposes). If you want it to work on any domain, you'll have to use a proxy.

You should use Javascript to make an ajax request to that URL and it will return the information you want in a format you specify, usually JSON. Depending on what Javascript libraries you are/aren't using, there's different ways you could do that -- probably the most common would be to use jQuery to make your request. Here's info on that API:
https://api.jquery.com/jQuery.get/

cannot manipulate response from xmlHttpRequest 2

I'm using XHR 2 to upload/save files.
According to the response of the server I want to perform an action. For example if the responce is "Saved" I want to hide a div or if the response is "Not Saved" I want to show another div etc...
I implemented what appears to be a simple code that should be working , but is not
Here is the snippet of the XHR
//initialize
var xhr = new XMLHttpRequest();
xhr.open('POST', 'upload.php');
xhr.responseType="text";
xhr.onload = function() {
//if all ok....
if (xhr.status === 200)
{
//update html5 progress bar
progress.value = progress.innerHTML = 100;
//get the respnse
var data=xhr.response;
//convert it to sting - kind of overkill, I know, but I'm stack
var data2=data.toString();
//alert it -- works
alert('data2 '+data2);
//now, do something, according to the response -- NOT working, never alert anything
if (data2=="Not Saved"){alert('Ooops, not saved');}
if(data2=="Saved"){alert('It's all good');}
if(data2=="File too big"){alert('hey, you are watching Jake and Amir');}
document.getElementById('imagesaved').innerHTML=data;
}
//refers to if (xhr.status === 200)
else {document.getElementById("imagesaved").innerHTML="Connect to server failed";}
What is wrong here? This should be working right? Any suggestions?
Thanks
EDIT
I put the alerts for testing. What I actually want to do is call some functions.
If I put
if (data2=="Not Saved"){functionOne();}
if(data2=="Saved"){functionTwo();}
if(data2=="File too big"){functionThree();}
the functions never get called
if I put
if (data2!="Not Saved"){functionOne();}
if(data2!="Saved"){functionTwo();}
if(data2!="File too big"){functionThree();}
ALL the functions are called!!!
I still dont get it...Maybe its something with the response? Or the onload function?
Thanks again

What I finally did is make the server response with numbers, not text. So encoding does not matter any more...
This is the code
var xhr = new XMLHttpRequest();
xhr.onload = function() {
if (xhr.status == 200)
{
var data=xhr.response;
if(data==1)
//say to the user is saved
{document.getElementById('imagesaved').innerHTML="Saved";}
//say to the user, there was an error
else{document.getElementById('imagesaved').innerHTML="Error";}
}
//say to the user that connection to the server failed
else {document.getElementById("imagesaved").innerHTML="Cannot connect";}
};
xhr.open('POST', 'upload.php');
xhr.send(formData);
This is a workaround. I dont know if its the right way to solve this problem , technically. I decided to post it anyway, to help others to quickly solve similar problems. If anyboy else has a better way to suggest , please do.

In this line : if(data2=="Saved"){alert('It's all good');}, you have to escape " ' ".
So convert it to : if(data2=="Saved"){alert('It\'s all good');}
Are you sure that the response of your ajax is text/plain ?
Look on the console (ctrl+shift+i on chrome, F12 on firefox), on net or network tab.
Look on console tab if you got some javascript errors too.

Using AJAX and a huge text file

I have a huge text file and I am going to pick 5 aléatoir ligne to read and store the content into an array but when I'm testing the response that I get with an alert() it doesn't show all the content.
function loadWords(){
var xhr = new XMLHttpRequest();
xhr.open('GET', "dico/francais.txt");
xhr.onreadystatechange = function(){
if(xhr.readyState == xhr.DONE && xhr.status == 200){
alert(xhr.responseText);
}
}
xhr.send(null);
}
is there any other way more powerful to get the job done?

You cannot put massive data into alert();
alert will always strip it after a certain length (sometimes when your screen resolution is not big enough to display it all etc.)
What you could do, is to put all of it into a textarea in HTML in order to take a look at it.